AI Search Glossary
Plain-English definitions of the terms that matter in AI search: GEO, AEO, AI Overviews, llms.txt, Share of Model, Zero-Click Search and more.
GEO
GEO (Generative Engine Optimization) is the discipline of making your brand visible, correctly described and recommended inside AI-generated answers from ChatGPT, Perplexity, Gemini and AI Overviews.
AEO
AEO (Answer Engine Optimization) is the practice of getting your brand and content cited inside the direct answers of AI engines — ChatGPT, Perplexity, Gemini and Google AI Overviews.
AI Overviews
Google AI Overviews are AI-generated summaries shown above search results.
llms.txt
llms.
Share of Model
Share of model measures how often AI engines mention your brand versus competitors in a category — the AI-era equivalent of share of voice.
Zero-Click Search
Zero-click search is when a search ends without the user clicking any website — the answer is consumed on the results page itself.
Terms are nice. Scores are better.
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