AI Glossary: 100+ Artificial Intelligence Terms Explained
Updated July 15, 2026 · Plain-English reference

AI Glossary: Essential Artificial Intelligence Terms Explained

Understand the language of artificial intelligence with clear, practical definitions of AI agents, LLMs, prompts, embeddings, RAG, vector databases, generative AI, machine learning, governance, safety, and more.

112 carefully written definitions A–Z navigation Beginner and professional friendly No horizontal-scroll tables
AI Glossary
Editorial note These definitions are educational summaries, not legal, financial, medical, security, or engineering advice. AI terminology can vary between researchers, vendors, standards bodies, and regulators, so important decisions should be checked against the relevant primary source.

Start with the essential AI concepts

New to artificial intelligence? These four ideas provide a useful foundation before you explore the full glossary.

AIThe broad field of building systems that perform tasks associated with intelligence.
Machine learningMethods that learn patterns from data instead of relying only on fixed rules.
Generative AISystems that create new text, images, audio, video, code, or structured data.
LLMA large model trained to understand and generate language and related data.

A

10 terms

AI Agent

An AI agent is a software system that works toward a goal by interpreting input, deciding what to do, and using available tools or data sources. Unlike a basic chatbot that only returns text, an agent may search, call an API, update a file, or complete a multi-step workflow.

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Agentic AI

Agentic AI describes AI systems designed to plan and take actions with a degree of autonomy. These systems usually combine a model, instructions, memory, tools, and safeguards so they can complete longer tasks rather than respond to only one prompt.

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Algorithm

An algorithm is a defined set of steps used to solve a problem or transform input into output. In AI, algorithms are used for training models, ranking results, recognizing patterns, making predictions, and optimizing decisions.

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Alignment

AI alignment is the effort to make an AI system behave in ways that match intended human goals, rules, and values. Alignment work includes training, evaluation, policy constraints, monitoring, and methods that reduce harmful or unintended behavior.

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Artificial General Intelligence (AGI)

Artificial general intelligence is a hypothetical form of AI that could perform a broad range of intellectual tasks at a human level or beyond. Current AI systems can be highly capable, but there is no universally accepted proof that AGI has been achieved.

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Artificial Intelligence (AI)

Artificial intelligence is the broad field of creating computer systems that can perform tasks associated with human intelligence, such as understanding language, recognizing images, making predictions, planning, and generating content.

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Attention Mechanism

An attention mechanism helps a model determine which parts of an input are most relevant to each other. Attention is a central feature of transformer models and supports tasks such as translation, summarization, question answering, and long-context reasoning.

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AI Assistant

An AI assistant is an application that helps users complete tasks through natural-language interaction. It may answer questions, draft content, summarize documents, analyze information, write code, generate images, or connect with other software. Compare popular AI assistants.

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AI Bias

AI bias is a systematic tendency that produces unfair, distorted, or unrepresentative outputs. Bias can enter through training data, labeling, model design, deployment choices, or the way results are interpreted.

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AI Governance

AI governance is the collection of policies, responsibilities, controls, and review processes used to manage AI safely and lawfully. It often covers privacy, security, accountability, model risk, human oversight, documentation, and regulatory compliance.

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B

3 terms

Benchmark

A benchmark is a standardized test or dataset used to compare the performance of AI models. Benchmarks can measure capabilities such as reasoning, coding, factual accuracy, image understanding, speed, cost, or safety, but no single benchmark captures every real-world use case.

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Black-Box Model

A black-box model is a system whose internal reasoning is difficult for users or developers to interpret. The model may produce accurate results while offering limited visibility into why a particular prediction or output was generated.

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Bot

A bot is software that performs automated actions. Some bots follow fixed rules, while AI-powered bots can understand natural language, adapt responses, retrieve information, and complete more flexible tasks.

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C

8 terms

Chatbot

A chatbot is an interface that allows people to communicate with software through text or voice. Modern AI chatbots can generate responses, summarize information, answer questions, and assist with tasks across many domains. Compare leading AI chatbots.

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Classification

Classification is a machine-learning task that assigns an input to one or more categories. Examples include identifying spam email, detecting sentiment, classifying an image, or routing a customer-support request.

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Computer Vision

Computer vision is the field of AI concerned with understanding images and video. It powers applications such as object detection, medical-image analysis, facial recognition, quality inspection, document scanning, and autonomous navigation.

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Context Window

A context window is the amount of information a model can consider during one interaction, usually measured in tokens. A larger context window can support longer documents and conversations, but effective use still depends on model design and the quality of the supplied context.

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Conversational AI

Conversational AI refers to systems that communicate with people using natural language. It may combine speech recognition, language understanding, dialogue management, retrieval, and generative models.

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Copilot

A copilot is an AI assistant embedded into a workflow to help a human complete tasks. Coding copilots, writing copilots, and business copilots are designed to support the user rather than necessarily operate independently.

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Chain of Thought

Chain of thought is a term used for intermediate reasoning steps that may help a model solve complex tasks. In practical applications, users should focus on verifiable explanations, calculations, sources, and final reasoning summaries rather than assuming hidden internal steps are reliable.

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Chunking

Chunking is the process of splitting large documents or datasets into smaller pieces. Retrieval systems use chunks so they can find and send the most relevant passages to a model without loading an entire source at once.

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D

7 terms

Data Annotation

Data annotation is the process of adding labels or structured information to raw data. Human or automated annotations may identify objects, categories, sentiment, entities, correct answers, or other signals needed for training and evaluation.

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Data Set

A data set is an organized collection of examples used to train, validate, test, or operate an AI system. Its quality, coverage, permissions, and representativeness strongly influence model performance.

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Deep Learning

Deep learning is a branch of machine learning that uses neural networks with many layers. It is widely used for language models, image generation, speech recognition, recommendation systems, and complex pattern recognition.

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Deepfake

A deepfake is synthetic or manipulated media created to convincingly imitate a real person, event, voice, image, or video. Deepfakes can be used creatively, but they also create risks involving fraud, misinformation, impersonation, and consent.

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Diffusion Model

A diffusion model is a generative model that learns to create data by reversing a gradual noising process. Diffusion techniques are widely associated with image generation and can also be applied to audio, video, and other data types.

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Discriminative Model

A discriminative model learns to distinguish between classes or predict a target from input data. For example, it may classify whether an image contains a cat or determine whether a transaction is fraudulent.

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Distillation

Model distillation is a technique in which a smaller model learns from a larger or more capable model. The aim is often to reduce cost, memory use, and latency while retaining useful performance.

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E

5 terms

Embedding

An embedding is a numerical representation of data such as text, images, products, or users. Items with similar meanings are placed closer together in a mathematical space, enabling semantic search, recommendations, clustering, and retrieval.

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Edge AI

Edge AI runs AI processing on or near the device where data is created, such as a phone, camera, vehicle, or industrial controller. It can reduce latency, bandwidth use, and dependence on cloud connectivity.

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Emergent Behavior

Emergent behavior describes capabilities or patterns that appear from a complex AI system without being explicitly programmed as separate rules. Claims of emergence should be evaluated carefully because measurement methods can influence what appears sudden or unexpected.

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Evaluation

AI evaluation is the process of measuring a model or system against defined criteria. Good evaluation combines automated metrics, human review, safety testing, domain-specific tasks, and real-world monitoring.

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Explainable AI (XAI)

Explainable AI includes techniques that help people understand how an AI system reached a prediction or recommendation. Explanations can improve auditing and trust, although a simplified explanation may not fully represent the model’s internal operation.

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F

6 terms

Feature

A feature is an input variable or measurable property used by a machine-learning model. In a house-price model, features might include location, floor area, number of rooms, and age of the building.

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Few-Shot Learning

Few-shot learning is the ability to perform a task using only a small number of examples. In prompting, users may provide several demonstrations to show the model the expected format or behavior.

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Fine-Tuning

Fine-tuning adapts a pre-trained model to a narrower task, domain, style, or behavior using additional training data. It can improve consistency for specialized use cases, but it requires careful data preparation, evaluation, and maintenance.

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Foundation Model

A foundation model is a large model trained on broad data that can be adapted to many downstream tasks. Language, vision, audio, and multimodal foundation models can serve as the base for assistants, generators, classifiers, and domain-specific applications.

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Frontier Model

A frontier model is an informal term for a highly capable model near the current boundary of AI performance. Because definitions vary, comparisons should specify the capabilities, tests, release date, and risks being discussed.

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Function Calling

Function calling lets a model produce structured instructions for an external tool or software function. A host application validates the request, runs the function, and returns the result to the model or user.

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G

5 terms

Generative AI

Generative AI refers to systems that create new content such as text, images, audio, video, code, or structured data. The output is generated from learned patterns and user-provided instructions rather than copied as a fixed response. Browse generative AI tools by category.

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Generative Adversarial Network (GAN)

A GAN uses two neural networks that compete during training: a generator creates samples and a discriminator evaluates them. GANs have been used for image synthesis, enhancement, style transfer, and synthetic data.

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Grounding

Grounding connects an AI response to supplied evidence, trusted data, tools, or real-world context. Grounded systems can reduce unsupported claims, but users should still verify important outputs.

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GPU

A graphics processing unit is a processor designed for highly parallel computation. GPUs are widely used to train and run AI models because many model operations can be performed efficiently in parallel.

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Guardrails

Guardrails are technical and policy controls intended to keep an AI system within acceptable boundaries. They may include input filters, output checks, access controls, rate limits, human approval, and monitoring.

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H

3 terms

Hallucination

An AI hallucination is an output that is unsupported, inaccurate, or fabricated while sounding plausible. Hallucinations can be reduced through better prompts, retrieval, tool use, verification, and system design, but they cannot be assumed to disappear completely.

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Human-in-the-Loop

Human-in-the-loop systems include human review, correction, approval, or escalation within an AI workflow. This is especially important when decisions affect safety, finances, employment, health, rights, or reputation.

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Hyperparameter

A hyperparameter is a configuration chosen before or during model training rather than learned directly from the data. Examples include learning rate, batch size, number of layers, and regularization strength.

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I

4 terms

Inference

Inference is the process of using a trained model to generate a prediction, classification, recommendation, or response. Inference cost and speed depend on model size, hardware, input length, output length, and optimization.

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Input

Input is the information supplied to an AI system, including text, images, audio, files, sensor readings, instructions, or structured data. Clear and relevant input generally improves the usefulness of the output.

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Instruction Tuning

Instruction tuning trains a model on examples of instructions and desired responses. It helps a general model follow user requests more reliably across a range of tasks.

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Interpretability

Interpretability is the degree to which people can understand the operation or decisions of a model. It may involve transparent model design, feature analysis, visualizations, counterfactual examples, or post-hoc explanation tools.

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K

2 terms

Knowledge Graph

A knowledge graph represents entities and the relationships between them in a structured network. It can help search engines, recommendation systems, and AI applications connect facts and understand context.

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Knowledge Base

A knowledge base is an organized source of information used by people or software. In AI applications, it may contain documents, policies, product information, support articles, records, or structured facts used for retrieval and grounding.

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L

5 terms

Label

A label is the expected category, value, or annotation attached to a training example. In supervised learning, the model learns to map inputs to labels.

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Large Language Model (LLM)

A large language model is a neural-network model trained on extensive text or multimodal data to process and generate language. LLMs can draft, summarize, translate, answer questions, write code, and support tool-based workflows.

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Latency

Latency is the time between sending a request and receiving a response. AI latency can be influenced by network conditions, model size, hardware, prompt length, generation length, and system load.

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Learning Rate

The learning rate controls how much a model’s parameters change during each training update. A value that is too high can make training unstable, while a value that is too low can make learning slow.

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LoRA

Low-Rank Adaptation is a parameter-efficient fine-tuning method that trains small additional matrices instead of updating every model parameter. It can reduce the computing and storage required to customize a model.

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M

6 terms

Machine Learning (ML)

Machine learning is a branch of AI in which systems learn patterns from data to make predictions or decisions. Major approaches include supervised, unsupervised, self-supervised, and reinforcement learning.

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Machine Translation

Machine translation uses software to translate text or speech between languages. Modern systems often use transformer-based models and may be improved with domain terminology, context, and human review.

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Model

An AI model is a learned mathematical system that transforms input into output. A model’s behavior depends on its architecture, parameters, training data, training process, instructions, and surrounding application.

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Model Card

A model card is documentation describing a model’s intended uses, limitations, evaluation results, training context, and risk considerations. The detail and format vary across organizations.

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Model Context Protocol (MCP)

Model Context Protocol is an open protocol for connecting AI applications with tools and data sources through a standardized interface. Implementations should still apply authentication, authorization, validation, and security controls.

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Multimodal AI

Multimodal AI can process or generate more than one type of data, such as text, images, audio, video, or documents. A multimodal model may understand an image and answer questions about it or create media from text instructions.

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N

4 terms

Natural Language Processing (NLP)

Natural language processing is the field of computing focused on understanding, analyzing, and generating human language. NLP includes translation, sentiment analysis, search, summarization, speech applications, and conversational AI.

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Neural Network

A neural network is a layered computational model made of connected units that learn patterns by adjusting numerical weights. Neural networks are used in deep learning for language, vision, audio, prediction, and generation.

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No-Code AI

No-code AI tools let users build or use AI workflows through visual interfaces and configuration rather than traditional programming. Complex or high-risk deployments may still require technical oversight.

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Nondeterminism

Nondeterminism means the same AI request may produce different results across runs. Variation can come from sampling settings, model updates, system context, tool results, and infrastructure.

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O

4 terms

Open-Source AI

Open-source AI generally refers to AI software, models, or supporting components released with permissions to inspect, use, modify, or distribute them. The exact freedoms vary by license, and publicly available model weights are not always equivalent to fully open source.

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Orchestration

AI orchestration coordinates models, tools, prompts, data, memory, routing, and workflow steps. An orchestration layer decides which component should run and how results move through the system.

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Output

Output is the result produced by an AI system, such as text, an image, a score, a classification, code, audio, or an action request. Outputs should be reviewed according to the risk and purpose of the task.

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Overfitting

Overfitting occurs when a model learns training data too closely and performs poorly on new data. Validation, regularization, data diversity, and appropriate model complexity can help reduce it.

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P

8 terms

Parameter

A parameter is a numerical value learned during model training. Model size is often described by parameter count, although more parameters do not automatically guarantee better real-world performance.

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Perplexity

Perplexity is a metric used to measure how well a language model predicts a sequence. Lower perplexity can indicate better prediction on a particular dataset, but it does not directly measure every useful capability.

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Predictive AI

Predictive AI uses historical or current data to estimate future outcomes or classify likely events. Examples include demand forecasting, churn prediction, credit risk, maintenance forecasting, and fraud detection.

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Pre-Training

Pre-training is the initial large-scale training stage in which a model learns broad patterns from extensive data. The model may later be instruction-tuned, fine-tuned, aligned, or connected to retrieval systems.

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Prompt

A prompt is the instruction or context given to an AI model. It may contain a task, background information, examples, constraints, desired format, source material, and evaluation criteria.

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Prompt Engineering

Prompt engineering is the practice of designing and testing instructions that help an AI system produce useful, reliable, and well-structured results. Strong prompts define the goal, context, constraints, format, and quality expectations. Explore our Best AI Prompts guide.

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Prompt Injection

Prompt injection is an attempt to manipulate an AI system through instructions embedded in user input, documents, websites, or tool results. Defenses include isolation of untrusted content, permission controls, validation, and limiting tool authority.

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Prompt Template

A prompt template is a reusable structure with placeholders for variable information. Templates improve consistency across repeated tasks such as product descriptions, support replies, summaries, and evaluations.

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Q

2 terms

Quantization

Quantization reduces the numerical precision used to store or run a model. It can lower memory use and improve speed, although aggressive quantization may reduce accuracy or output quality.

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Question Answering

Question answering is an AI task in which a system responds to questions using its learned knowledge, supplied context, retrieved sources, tools, or a combination of these.

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R

6 terms

Reinforcement Learning

Reinforcement learning trains an agent through rewards or penalties received after actions. The agent learns a strategy intended to maximize cumulative reward in an environment.

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Reinforcement Learning from Human Feedback (RLHF)

RLHF uses human preferences or judgments to help train a model toward desired behavior. It is one of several approaches used to improve instruction following, helpfulness, and safety.

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Retrieval-Augmented Generation (RAG)

Retrieval-augmented generation combines information retrieval with a generative model. The system finds relevant content from external sources and supplies it as context, which can improve freshness, specificity, and traceability.

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Reranker

A reranker is a model or algorithm that reorders retrieved results based on relevance. In a RAG system, reranking can improve which document chunks are sent to the language model.

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Responsible AI

Responsible AI is the practice of designing, deploying, and governing AI with attention to safety, fairness, privacy, transparency, accountability, accessibility, and human impact.

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Robotics

Robotics combines mechanical systems, sensors, control software, and often AI to interact with the physical world. AI can support perception, planning, navigation, manipulation, and human-robot interaction.

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S

7 terms

Self-Supervised Learning

Self-supervised learning creates training signals from the data itself rather than relying entirely on human labels. Many modern language and vision models learn broad representations through self-supervised objectives.

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Sentiment Analysis

Sentiment analysis classifies the emotional tone or opinion expressed in text. It is used for customer feedback, social listening, market research, and support analysis, but context and cultural differences can affect accuracy.

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Small Language Model (SLM)

A small language model is designed with fewer parameters or lower computing requirements than a large language model. SLMs can be useful for on-device processing, lower cost, lower latency, and focused tasks.

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Speech Recognition

Speech recognition converts spoken language into text or structured commands. It is used in transcription, voice assistants, accessibility tools, call analysis, and hands-free interfaces.

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Synthetic Data

Synthetic data is artificially generated information that imitates properties of real data. It may help expand training coverage or protect privacy, but poor synthetic data can reproduce errors, bias, or unrealistic patterns.

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System Prompt

A system prompt is a high-priority instruction that defines an AI assistant’s role, behavior, boundaries, and operating context. Applications should not rely on a system prompt alone for security.

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T

8 terms

Temperature

Temperature is a generation setting that influences randomness in model output. Lower values usually make responses more predictable, while higher values can increase variety and creativity.

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Token

A token is a unit of text processed by a language model. A token may be a word, part of a word, punctuation, or another text fragment, and token counts affect context limits, speed, and usage cost.

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Tokenization

Tokenization is the process of splitting input into tokens that a model can process. Different tokenizers may divide the same sentence differently.

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Tool Use

Tool use allows an AI model to request actions from external systems, such as search, calculation, databases, calendars, email, code execution, or business applications. The host system should validate every action and enforce permissions.

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Training

Training is the process of adjusting model parameters using data and an optimization objective. Training may include pre-training, fine-tuning, preference optimization, safety tuning, and evaluation.

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Training Data

Training data is the information used to teach a model patterns and behaviors. Its quality, legality, diversity, documentation, and relevance can strongly affect model outcomes.

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Transformer

A transformer is a neural-network architecture built around attention mechanisms. Transformers support parallel training and are widely used in language models, vision models, audio systems, and multimodal AI.

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Turing Test

The Turing Test is a historical proposal for evaluating whether a machine can imitate human conversation well enough to be indistinguishable in a text interaction. It is not a complete measure of intelligence, truthfulness, or safety.

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U

2 terms

Underfitting

Underfitting occurs when a model is too simple, insufficiently trained, or poorly configured to learn important patterns in the data. It performs poorly on both training examples and new examples.

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Unsupervised Learning

Unsupervised learning identifies patterns or structure in data without labeled target answers. Common applications include clustering, anomaly detection, dimensionality reduction, and representation learning.

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V

4 terms

Validation Data

Validation data is a separate set of examples used during development to tune choices and compare model versions. It should be distinct from the final test set.

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Vector

A vector is an ordered list of numbers. In AI, vectors often represent the features or meaning of text, images, audio, users, or products.

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Vector Database

A vector database stores and searches embeddings. It is commonly used for semantic search, recommendation systems, similarity matching, and retrieval-augmented generation.

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Vision-Language Model (VLM)

A vision-language model processes both visual and textual information. It may describe images, answer visual questions, read screenshots, analyze diagrams, or connect image content with natural-language instructions.

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W

2 terms

Weights

Weights are learned numerical values that determine how signals move through a neural network. Together with the architecture and other parameters, they shape the model’s behavior.

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Workflow Automation

Workflow automation uses rules, integrations, and sometimes AI to move work through repeatable steps. AI can classify requests, generate content, extract data, make recommendations, or choose the next action.

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Z

1 terms

Zero-Shot Learning

Zero-shot learning is the ability to perform a task without task-specific examples in the prompt or dedicated training examples for that exact task. The model relies on general capabilities and the instruction provided.

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Why readers use this AI glossary

These are purpose-based experience cards—not fabricated customer testimonials or ratings.

For beginners

Learn essential AI terms without needing a computer-science background or reading highly technical papers first.

For professionals

Clarify terminology used in product meetings, vendor comparisons, AI policies, workflows, and purchasing decisions.

For students and writers

Use concise definitions as a starting point, then consult and cite the primary sources required by your institution or publication.

Editorial methodology and authority signals

A glossary earns trust through accuracy, clarity, transparent sourcing, regular review, and honest limits—not through exaggerated ranking promises.

How this glossary was prepared

  • Definitions are written in original, plain English.
  • Ambiguous or hypothetical concepts are clearly described as such.
  • High-risk terms include practical limitations or verification guidance.
  • Visible page content matches the FAQ and glossary structured data.
  • No invented user ratings or review markup is included.

Frequently asked questions about AI terminology

What is an AI glossary?

An AI glossary is a collection of plain-language definitions for artificial-intelligence terms, abbreviations, methods, risks, and technologies. It helps beginners, professionals, students, and business users understand AI discussions without having to consult many separate sources.

What is the difference between AI, machine learning, and deep learning?

Artificial intelligence is the broad field. Machine learning is a branch of AI in which systems learn patterns from data. Deep learning is a branch of machine learning that uses multi-layer neural networks.

What is the difference between generative AI and predictive AI?

Generative AI creates new content such as text, images, audio, or code. Predictive AI estimates likely outcomes, categories, or future events from data. Some products combine both approaches.

What is a large language model?

A large language model is a neural-network model trained on extensive language or multimodal data. It can process and generate text, summarize information, answer questions, write code, and support tool-based applications.

What is retrieval-augmented generation?

Retrieval-augmented generation, or RAG, retrieves relevant information from external sources and supplies it to a generative model as context. This can improve freshness and traceability, although important answers should still be verified.

What is an AI hallucination?

An AI hallucination is a confident-looking output that is inaccurate, unsupported, or fabricated. Grounding, retrieval, tool use, citations, and human verification can reduce the risk.

What is prompt engineering?

Prompt engineering is the practice of designing and testing instructions that clearly specify the goal, context, constraints, evidence, desired format, and quality standard for an AI system.

How often should an AI glossary be updated?

A useful glossary should be reviewed regularly because terminology and common practices evolve quickly. Core concepts may remain stable, while product-specific terms, protocols, model capabilities, and governance language may change.

Can AI definitions vary between companies?

Yes. Some terms have established technical meanings, while others are used differently across vendors, researchers, regulators, and marketing teams. This glossary explains the common meaning and notes uncertainty where appropriate.

Does schema markup guarantee higher Google rankings?

No. Structured data can help search engines understand page content, but it does not guarantee rankings or rich results. Helpful content, crawlability, relevance, reputation, links, and user experience remain important.

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