Definition
An AI Overview is an AI-generated summary that Google shows at the top of a search results page, written by a Gemini model and linked to the web pages it drew on. It appears only for queries where Google's systems decide a summary adds something beyond the classic results, so many searches show none. Google introduced the feature in May 2024 as the successor to its Search Generative Experience (SGE) test, and Sundar Pichai said at Google I/O in May 2026 that AI Overviews had more than 2.5 billion monthly users.
Google's documentation says AI Overviews, like AI Mode, may use a query fan-out technique: the system runs several related searches, reads the retrieved pages, writes a summary and attaches supporting links, often a wider set of sites than the top ten blue links. Gemini 3 has been the default model for AI Overviews globally since January 27, 2026. The same month Google made follow-up questions asked from an AI Overview open an AI Mode conversation, and at I/O 2026 it described the two as a single AI Search experience. Availability is broad: Google expanded AI Overviews to more than 200 countries and territories in May 2025, and its help page now lists nearly 100 supported languages.
An AI Overview differs from a featured snippet in that it writes a new answer from several sources instead of quoting one page. Pew Research Center's analysis of 68,879 Google searches by US adults in March 2025 is still the clearest public look at how people react: 18% of searches produced an AI summary, 88% of those summaries cited three or more sources, and users clicked a regular result on 8% of visits with a summary versus 15% without one. Clicks on links inside the summary happened on 1% of visits (Pew Research Center). That pattern is why being cited, and being named in the summary text, now matters alongside ranking. See zero-click search.
Google says there are no extra technical requirements for AI Overviews: a page must be indexed and eligible to show a snippet, and normal SEO practice applies. There is no special schema or AI text file to add. What the sources look like is easier to observe than to predict. In Promptwatch's AI Overviews citation types data, listicles make up about 27% of cited content, nearly double the next format. Pew's study found Wikipedia, YouTube and Reddit were the sources linked most often in AI summaries.
AI Overviews also carry ads. Ads can appear above or below an AI Overview in all markets where the feature runs, and inside it in English in 12 countries, including the US, Canada, India and Australia. Google does not place ads inside AI Overviews in sensitive categories such as health, finance and politics. See AI search ads.
For measurement, links shown in AI Overviews count toward Search Console's Performance report, and since August 31, 2026 every site can open a Generative AI performance report that isolates AI Overview impressions (combined with AI Mode). A Search generative AI control in Search Console lets a site opt out of AI Overviews entirely. Neither tool shows which queries produced the summary or what it said about your brand, so teams still run the prompts that matter and record the citations and mentions. Our guide to optimizing for AI Overviews covers the practical steps.
Examples of AI Overview
- A search for 'why is my pool green and how do I clean it' returns an AI Overview with cleaning steps drawn from three pool-care sites and, in the US, a shopping ad for pool vacuums inside the summary, the example Google itself uses in its Ads help.
- A personal finance publisher notices its guide is cited in AI Overviews for 'how does a backdoor Roth IRA work' while a competitor ranks first organically, because its page answers the eligibility question in a single clear paragraph.
- A SaaS company compares Search Console's Generative AI performance report with its own prompt tracking and finds AI feature impressions rising for its comparison pages while the AI Overview text names two competitors and not its own brand.
- A news site uses the Search generative AI control to opt its archive subdomain out of AI Overviews and AI Mode while leaving the main domain included, using the property inheritance rules Google documents.
