A Google AI Overview is the generated answer box that sits above the regular results on many Google searches. Instead of a list of links, you get a few short paragraphs or bullet points that answer your search, with links to the web pages behind the answer. This page sits under our guide to the difference between People Also Ask and AI Overviews, and it covers what the feature is, when it shows up, how it picks its sources, what it means for websites, and whether you can switch it off.
What Google says an AI Overview is
Google’s help page, AI Overviews in Google Search, says the feature can “take the work out of searching by providing an AI-generated snapshot with key information and links to dig deeper.” Its developer documentation, AI features and your website (last updated 10 December 2025), adds the purpose: AI Overviews “help people get to the gist of a complicated topic or question more quickly, and provide a jumping off point to explore links to learn more.”
Three things set it apart from a normal result:
- It is written, not quoted. The text is generated by a model. A featured snippets box, by contrast, quotes a passage from one page.
- It usually draws on several pages. In a Pew Research Center study of Google searches made in March 2025, 88% of AI summaries cited three or more sources and only 1% cited a single source.
- It answers your search, not the questions around it. That is the main difference from People Also Ask, which our parent page covers in detail.
A short history of AI Overviews
AI Overviews started as an experiment in Search Labs, which users had to sign up for. On 14 May 2024 Google announced that “AI Overviews will begin rolling out to everyone in the U.S., with more countries coming soon,” and said that people had “already used AI Overviews billions of times through our experiment in Search Labs.”
| Date | What changed | Source |
|---|---|---|
| 14 May 2024 | Rolled out to everyone in the U.S., powered by “a new Gemini model customized for Google Search” | |
| 28 October 2024 | Began “rolling out in more than 100 countries and territories”; Google said it would reach “more than 1 billion global users every month” | |
| 27 January 2026 | Gemini 3 became “the new default model for AI Overviews globally”, and you can ask a follow-up question from an AI Overview and carry on in AI Mode |
Google’s help page now lists the countries, territories and languages where AI Overviews are available. It is a long list, so check it there if you need a specific market.
When does an AI Overview show up?
Not on every search. Google’s help page says you will find them “when our systems determine that generative AI can be especially helpful.” The developer documentation is more blunt: “AI Overviews are only shown when our systems determine that it is additive to classic Search, and as such, often don’t trigger.”
The best independent measure of how often that happens comes from the Pew Research Center. It tracked the browsing of 900 U.S. adults in March 2025, covering 68,879 unique Google searches. Its findings on when AI summaries appeared:
| Type of search | Share that showed an AI summary |
|---|---|
| All searches in the study | 18% |
| One- or two-word searches | 8% |
| Searches of 10 words or more | 53% |
| Searches starting with a question word (who, what, when, why) | 60% |
So the longer and more question-like the search, the more likely you are to see one. Pew also found the typical (median) summary was 67 words long, though they ranged from 7 to 369 words. Keep in mind this is one month of U.S. data from 2025, before the Gemini 3 upgrade, so treat the exact shares as a snapshot.
How does an AI Overview pick its sources?
Google has explained the method in general terms, without publishing the details. Its guide to optimizing for generative AI features (last updated 10 July 2026) says the features “are rooted in our core Search ranking and quality systems.” Two techniques do most of the work:
- Retrieval-augmented generation, or grounding. Google says this relies on “our core Search ranking systems to retrieve relevant, up-to-date web pages from our Search index.” The model then writes from those pages and shows “prominent, clickable links to relevant web pages that support the information in the response.”
- Query fan-out. Google defines it as “A set of concurrent, related queries generated by the model to request more information.” Its example: a search for “how to fix a lawn that’s full of weeds” might fan out into searches such as “best herbicides for lawns” and “remove weeds without chemicals”.
The AI features page adds that while a response is being generated, Google’s models “identify more supporting web pages,” which lets it show “a wider and more diverse set of helpful links” than a classic search. It also notes that AI Mode and AI Overviews “may use different models and techniques, so the set of responses and links they show will vary.” We compare the two on is AI Mode more accurate than AI Overview?
Which sites end up cited? Pew found that Wikipedia, YouTube and Reddit were the most commonly linked sources in both AI summaries and standard results. Together they made up 15% of the sources listed in the AI summaries it examined, close to their 17% share of standard results.
Can any page be a source?
Any page that Google can show with a snippet, on a site that has not opted out. The AI features page says that to be shown as a supporting link, “a page must be indexed and eligible to be shown in Google Search with a snippet,” and “There are no additional technical requirements.” Google’s newer guide adds that a site must also be “included in Search generative AI features in Search Console”, and inclusion is the default. Google also says there is no special markup or AI text file you need to add. What it does recommend is ordinary SEO: allow crawling, use internal links, keep important content in text, and write useful, original pages. We cover the practical side on how do you rank in AI Overviews? and, for AI engines beyond Google, what is generative engine optimization (GEO)?
Are AI Overviews accurate?
Google does not claim they are always right. Its help page says: “AI Overviews can and will make mistakes.” It also says the technology “may provide inaccurate or offensive information,” and advises: “Always check important info in more than one place.” How often they go wrong, and the well-known cases, are covered on how accurate are Google’s AI Overviews?
What AI Overviews mean for websites
This is where the arguments start, because the two best-known data points point in opposite directions.
- Google’s view. In its May 2024 launch post, Google said “the links included in AI Overviews get more clicks than if the page had appeared as a traditional web listing for that query.” Its developer documentation adds that clicks from results pages with AI Overviews “are higher quality (meaning, users are more likely to spend more time on the site).”
- Pew’s data. Users who saw an AI summary “clicked on a traditional search result link in 8% of all visits,” against 15% for users who did not. They clicked a link inside the summary in 1% of visits. And they ended their browsing session on 26% of pages with an AI summary, against 16% of pages without one.
Both can be true: fewer clicks overall, but the pages that are cited may do better than they would as a plain blue link. For the wider picture, see zero click searches and is SEO dead now with AI?
How to see if your site appears
Search Console has a generative AI performance report covering AI Overviews and AI Mode. Its help page says: “As of August 31, 2026, we’ve rolled out these insights to all websites worldwide.” It shows impressions, meaning “how many times links to your site were shown to a user in a generative AI feature on Google Search,” and you can break them down by page, country, device and date. For other ways to check, see how does AI Overview tracking work?
Controls for site owners
Google’s AI features page says robots.txt rules for Googlebot are the control for how a site is crawled for Search, and that “To limit the information shown from your pages in Search, use nosnippet, data-nosnippet, max-snippet, or noindex controls.” Because a page must be eligible for a snippet to be a supporting link, blocking snippets also takes it out of the running for AI Overviews. Search Console also has a Search generative AI control: inclusion is the default, Google rolled it out to all websites worldwide as of 31 August 2026, and a site that chooses to be excluded “won’t receive any traffic or impressions from these features.”
Can you turn off AI Overviews?
Not as a setting. Google’s help page says AI Overviews “are a core Google Search feature” and “Features cannot be turned off,” but the Web filter after a search “displays only text-based links without features like AI Overviews.” If it is the question box you want gone, see how to get rid of People Also Ask on Google.
AI Overviews and People Also Ask
The two now overlap more than they used to. Our parent page and is People Also Ask AI? track how many People Also Ask answers are now AI-generated. The questions, though, are still a separate thing: a list of related searches Google links to your topic, which is useful when you plan a page that might be cited. PAA Box is our Chrome extension for collecting those questions up to four levels deep and exporting them to CSV. It only reads the People Also Ask block. It does not read or track AI Overviews.