AI Glossary
518+ Terms from AI Systems to RAG — Reviewed for 2026
Whether you're building AI products, evaluating vendors, writing policy, or learning the basics, this glossary explains the language behind modern AI with concise definitions, examples, related terms, and source links.
Source-backed AI reference
Definitions are periodically reviewed and cross-checked against standards bodies, official glossaries, and primary research where relevant. Individual term update dates are shown only when a term has been explicitly revised.
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Start with the problem area you care about, then jump into the exact definitions below.
AI Basics
Core terms for understanding what AI systems are and how they work.
LLMs & Prompting
Language-model concepts that shape outputs, prompting, and automation.
RAG & Search
Retrieval, grounding, and search terms for source-backed AI answers.
Agents & Tool Use
Concepts for assistants that plan, call tools, and operate workflows.
Security & Abuse
Risks and controls for prompt injection, unsafe tools, and data leakage.
Governance & Compliance
Operational vocabulary for responsible AI adoption and regulation.
Evaluation & Quality
Measure output quality, hallucination risk, and system reliability.
Cost & Performance
Terms for latency, serving, scaling, and production efficiency.
Quick FAQ
🔍 How do I find a term fast?
Type any term in the search bar — it searches names, definitions, and aliases. Click related terms to explore connected concepts.
📚 Are these definitions technical or beginner‑friendly?
Both! Each term is tagged with difficulty (Beginner → Advanced). Start simple, then explore the technical depth as needed.
🔗 Can I link directly to a term?
Absolutely! Every term has a permanent URL anchor like #glossary-llm — perfect for documentation, Slack, or team wikis.
✨ What if a term is missing?
We update this glossary regularly with new terms as AI evolves. Missing something? Drop us a note — we're always adding!
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From foundational concepts like Machine Learning to cutting-edge techniques like RAG and MoE — filter by category (LLM, Safety, Training) or difficulty level to find exactly what you need.
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About this AI Glossary
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