Citation (AI answer)
In an AI answer, a citation is a source the engine references or links to while generating its response, and the number of sources cited per answer varies widely by engine, from about 2.5 for Copilot up to about 7.7 for Google AI Overviews.
A citation, in the context of an AI answer, is a source the model points to or draws from while generating its response: a page it links, a listing it pulls a phone number from, a review site it quotes. It's the AI-answer equivalent of a search result, except there are usually far fewer of them and they sit inside a paragraph of generated text instead of a list.
How many sources an engine cites per answer is not the same across engines. Profound's research, based on 100,000 prompts, found Google AI Overviews reference about 7.7 domains per response, Perplexity about 7.3, ChatGPT about 5.0, and Copilot about 2.5. Fewer citation slots means fewer businesses can appear at all, so getting cited in Copilot answers is a narrower target than getting cited in AI Overviews.
Different engines also don't cite the same sources for the same query. Profound found that Google AI Overviews and Google AI Mode cite the same URLs only 13.7% of the time, AI Overviews and Copilot overlap just 6%, and Perplexity and AI Overviews overlap 16.4%. Earning a citation in one engine is not evidence you'll earn one in another.
Nobody has published reliable evidence that structured data like schema.org markup increases your odds of being cited. The single empirical test that looked for a link between schema coverage and citation rates, run by Search Atlas, found no correlation. What does correlate is being a real, findable source with clear facts on the page: pricing, service area, and licensing stated plainly rather than buried in marketing language.
Keep exploring the glossary
- Answer EngineAn answer engine is an AI system, such as ChatGPT, Perplexity, Gemini, Google's AI Overviews, or Copilot, that responds to a question with a direct written answer naming a small number of options instead of a page of ranked links.
- Share of Voice (AI)AI share of voice is the percentage of tracked AI answers that name your business instead of a competitor's, measured per engine and across repeated prompts, since a single AI answer isn't a reliable sample.
- GroundingGrounding is when an AI model bases its answer on live, retrieved information, such as a web search result, instead of relying only on what it learned during training, which is meant to make answers more current and accurate.