What is an AI Overview?

How does Google choose the sources in an AI Overview?

Google describes a technique called retrieval-augmented generation, or grounding: the AI relies "on our core Search ranking systems to retrieve relevant, up-to-date web pages from our Search index," then links to the pages that support its answer. It may also use "query fan-out," which means "issuing multiple related searches across subtopics and data sources," so a page can be cited for a question it doesn't rank for directly.

There's no separate sign-up. To be eligible, Google says "a page must be indexed and eligible to be shown in Google Search with a snippet," and "there are no additional technical requirements." That's why Google calls optimizing for AI search "still SEO." Our guide to how GEO works covers what makes content more likely to be cited.

Do AI Overviews reduce clicks to websites?

The best independent data says yes. Pew Research Center tracked the browsing of 900 U.S. adults during March 2025. When an AI summary appeared, users clicked a traditional search result in 8% of visits. Without one, they clicked "nearly twice as often (15% of visits)." Clicks on the links inside the summary itself happened in "just 1% of all visits." The most frequently cited sources, in both AI summaries and regular results, were Wikipedia, YouTube, and Reddit.

Google tells a different story about the sites that do get cited. When it launched AI Overviews, it said "the links included in AI Overviews get more clicks" than the same page would get as a regular listing. Both can be true: being cited is better than being skipped, but the overall pool of clicks gets smaller when an AI Overview appears.

What is the difference between AI Overviews and AI Mode?

AI Overviews appear inside normal search results. AI Mode is a separate, conversational search experience that Google says is "particularly helpful for queries where further exploration, reasoning, or complex comparisons are needed." Both use the same approach to sources, and Google applies the same eligibility rules to both.

What do AI Overviews mean for a local business?

For an urgent search like "emergency plumber," the map pack and regular results still do most of the work. AI Overviews matter more earlier in the decision, when people ask about cost, what a job involves, or which option to choose. Those are the questions your website's articles and service pages should answer clearly, with real details from your own jobs.

You won't see AI Overview traffic as a separate number. Google says traffic from its AI features is "included in the overall search traffic in Search Console," in the Performance report under the Web search type. Google does offer controls like nosnippet to limit what it shows from your pages, but they limit your regular search snippets too, so most businesses are better off leaving them alone.