15 terms · plain language · deep-linkable definitions
AI SEO Glossary
The fifteen acronyms, protocols, crawlers, and concepts that actually matter in 2026 AI SEO. Each entry has its own deep page with the full definition, related-terms map, and FAQ. Click any card to jump in.
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How this glossary works: we used to ship all 15 definitions on this single page. To make every term a first-class entity that LLMs and search engines can canonical-link to, each definition now lives on its own dedicated page with expanded explanation, related-terms map, and FAQ. This page is the index — pick a term to jump to its full definition.
The 15 Terms
GEO — Generative Engine Optimization
The umbrella discipline of optimizing for generative-AI surfaces — citation, agent navigation, and first-party data exposure.
Read full definitionAEO — Answer Engine Optimization
The work of getting your brand cited inside AI-generated answers across ChatGPT, Perplexity, Claude, Copilot, Gemini, and Google AI Overviews.
Read full definitionGPTBot
OpenAI's training-data crawler. Distinct from OAI-SearchBot (live retrieval) and ChatGPT-User (user-triggered fetches).
Read full definitionClaudeBot
Anthropic's training-data crawler. Distinct from Claude-Web (live retrieval) and Claude-User (Project / Computer Use fetches).
Read full definitionPerplexityBot
Perplexity's web crawler. Plus Perplexity-User, the live-retrieval agent that fetches sources at answer time.
Read full definitionllms.txt
Markdown file at site root that gives LLMs a curated map of important pages. Proposed by Answer.AI's Jeremy Howard, Sept 2024.
Read full definitionMCP — Model Context Protocol
Anthropic's open-source protocol (Nov 2024) for connecting LLMs to first-party data sources. Lets a brand expose a server an LLM can query directly.
Read full definitionAP2 — Agent Payments Protocol
Google's open protocol (Sept 2025) for AI agents to authenticate, authorize, and complete payments on behalf of users.
Read full definitionschema.org / Structured Data
The W3C-backed vocabulary for marking up web content with machine-readable types. Foundation of every AI-citation engagement.
Read full definitionEntity SEO
The work of teaching search engines and LLMs that your brand is a recognized entity — through Organization schema, sameAs links, and Knowledge Graph mapping.
Read full definitionCitation Share
The percentage of category-relevant prompts on which an AI engine cites your brand. The closest thing AEO has to a clean KPI.
Read full definitionGoogle AI Overviews
Gemini-powered summary block above the classic Google SERP. Launched as SGE (May 2023), rebranded and made default in May 2024.
Read full definitionAgentic Commerce
The emerging commerce surface where AI agents (ChatGPT Agent, Claude Computer Use, Gemini) complete purchases on behalf of users.
Read full definitionRAG — Retrieval-Augmented Generation
The model pattern where an LLM grounds its answer in retrieved sources rather than relying on training-data memory alone.
Read full definitionStructured Data
Machine-readable annotations on web content, typically shipped as schema.org JSON-LD. The most-leveraged AEO foundation.
Read full definition
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