Glossary

Terms around GEO and AI visibility — explained briefly.

AEO (Answer Engine Optimization): Optimizing for AI answers; narrower than GEO since AI does more than answer.
AI Visibility: How often, how prominently and how accurately a brand is mentioned and cited in AI answers.
AI Visibility Index: VISIBILIS metric combining mention, citation, placement and competition into one visibility score.
Citation: The source reference or link an AI answer is based on.
Dark Search: Purchase decisions made invisibly in AI chat, untracked by classic analytics.
GEO (Generative Engine Optimization): Marketing discipline to increase a brand visibility in AI systems; the answer-engine counterpart to SEO.
Grounding / RAG: Method by which an LLM retrieves external, current sources live and builds them into the answer (Retrieval-Augmented Generation).
LLM (Large Language Model): Language model (e.g. GPT, Gemini, Claude) forming the technical core of AI systems.
Mention: A brand named in an AI answer (even without a link).
Share of AI: A brand share of all brand mentions on a topic in AI answers.