Definition
Zero-click rate has been climbing for a decade thanks to featured snippets and Knowledge Panels - but AI Overviews and ChatGPT Search accelerated it sharply. In a zero-click world, being cited <em>in</em> the answer is the conversion, not the start of one.
Why it matters
Zero-click search sits in the "Measurement" layer of the AI search stack. Teams that handle it well get cited more, recommended more, and earn more of the AI-mediated revenue in their category. Teams that ignore it spend a year wondering why their content investment never moves the needle inside ChatGPT or Perplexity.
Related terms
- AI Overviews - Google's generative-AI answer box at the top of search results, powered by Gemini. Now appears for more than half of qualifying US queries.
- ChatGPT Search - OpenAI's live-retrieval mode inside ChatGPT - pulls real-time web results, cites them, and answers in the chat surface.
- Mention rate - The percentage of prompts in a defined panel where an LLM names your brand. The headline metric of LLM SEO programs.
Apply it
The LLM SEO playbook ties every concept in this glossary into a single operating model. If you want to see how your brand performs across all the LLMs at once - mention rate, citation share, sentiment, rank - start with the free GEO audit or skip straight to a free Livesov account.