Definition
A page an engine shows or reports as the source of what it said. Perplexity and AI Overviews show them; ChatGPT with web search reports them in its response. Being cited is separate from being named.
In the report
Every cited URL in every answer is recorded. The 'sources the engines trust' table lists the domains by how often they were cited for your questions; 'own site cited' is counted separately because being named without being cited means the engine learned you from someone else's page.
Worked example
In the same email marketing run the engines cited g2.com in 10 of 36 answers and the company's own site in 7. A citation of your own page is worth more than a mention, because the engine fetched and trusted that page; the score adds a bonus for it. A citation of a page that never names you is the more useful fact: for that company, two directory pages cited in 9 and 8 answers named rivals only, and those two pages became the report's second fix.
How to move it
Get your own page cited by stating the fact the question asks for, near the top, in a sentence. Get cited elsewhere by being on the pages the table lists.
Where it shows up
What is AI visibility? How often AI answer engines name a company when a buyer asks who to consider in its category, and whether they cite its own pages when they do. It is measured as a share of recorded answers, weighted by position in the list and by citation, across ChatGPT, Perplexity, Gemini and Google AI Overviews.
Why is my competitor in ChatGPT's answer and I'm not? Because a page ChatGPT fetched for that question names them and not you: a review platform where they have more reviews, a roundup they are in, a comparison article, a thread. The engine did not choose them; the page did. The report's citations show which page it was, and that page is the fix.
See citation measured on your site
Your website, region and work email. The score appears in about three minutes, and the report is a link you keep.