What is AI Overviews.

AI Overviews is the AI summary Google shows above its search results page, synthesized from multiple sources.

It is the block that appears above the results when you ask a question — a few paragraphs long, with source links beside it. It does not replace the classic ten blue links; it sits on top of them and takes up most of the screen. The user has to scroll down to reach the classic results.

Technically it is not a new index. Google’s generative features feed on its own search index; the summary is synthesized from the pages in that index. A page that is not indexed cannot appear in AI Overviews either — the precondition is the same.

How widespread it is

According to industry reports, the share of queries covered by AI Overviews grew markedly from early 2025 into 2026 and it now appears on roughly half of all queries. The rate varies greatly by query type: very high on information-seeking queries, very low on transactional and navigational ones.

That distinction matters in practice. A user searching for a brand name is not shown a summary; a user asking “how to do X” almost always is. So the impact of AI Overviews depends directly on which query types bring your site its traffic.

1. Information-seeking queries — “what is,” “how,” “why.” Highest coverage; biggest impact.
2. Comparison queries — “X or Y.” High coverage; the summary usually covers both sides.
3. Transactional queries — “buy,” “price.” Low coverage; commercial results are preserved.
4. Navigational queries — brand names, login pages. Very low coverage.
5. Health, finance and law — variable coverage; Google is more cautious in these areas.

Its effect on clicks

This is the most debated topic, and the data draws a two-sided picture. On one hand, on queries where AI Overviews is shown, the click-through rate of the top positions drops visibly — the user already has the answer and does not click. On the other hand, pages mentioned INSIDE the summary see their click-through rate rise compared to rivals that are not mentioned.

Together they say this: on a query with a summary, the losing side is the page that ranks well but is not cited. The winning side is the cited page — even at a lower rank. The visibility race has separated from the ranking race.

The loser is the page that ranks well but is not cited.

This changes measurement habits too. A report that looks only at rankings cannot see what happens on summary queries: the position stays the same, the traffic drops, and the cause is invisible. Watching impressions and click-through rate together is the only way to expose the difference.

How source selection works

Google does not publish a detailed formula for how the summary’s sources are chosen. But observed behavior and the company’s own guidance point to a few things.

First, the selected unit is the passage, not the page. The summary takes one section each from several pages and synthesizes them; the whole page does not need to be about the topic — one section fully answering the question is enough.

Second, self-contained sections are preferred. A paragraph that answers a question without outside context is cited more easily than a page that spreads the same information across three sections.

Third, information that several sources agree on is preferred. A claim that appears on only one site struggles to enter the summary. This is also the explanation of why off-site presence matters.

Fourth, in Google’s own words there is no separate technique for appearing in generative features — the rules of good SEO apply. There is no new markup, no new tag, no special registration method.

What can be done

The concrete steps are covered in detail on the other pages of this cluster; here is the summary.

1. Put the question in a heading — let the question the user asks appear on the page as a heading, with the answer right beneath it.
2. Give the answer up front — let the section’s first sentence answer the question on its own; reasoning and detail come after.
3. Keep passages self-contained — no back-references; they should survive being quoted.
4. Add structured data — FAQ and how-to schemas make matching the asked question easier.
5. Make the date and the author visible — freshness and identity are the two pans of the trust scale.
6. Make sure the page is indexed — a page sitting in Search Console as “crawled, currently not indexed” can appear in no summary.

The last item is where most teams slip, and it is the cheapest win. Before starting answer engine optimization, the indexing picture must be clean; for pages crawled and rejected, the first job is content quality, not schema.

Measurement: how you see the impact

You cannot see the impact of AI Overviews on your site by opening a report — Search Console does not break out impressions inside summaries as a separate line. The impact is read indirectly, and there are a few ways to read it.

1. Impressions steady, clicks down — if a query group keeps its impressions while its click-through rate drops visibly, a summary may be showing on those queries.
2. Position steady, traffic down — if traffic fell while your position did not change, ranking is not the cause.
3. Split by query type — watch information-seeking and transactional queries separately; the impact concentrates in the former.
4. Check by hand — search your target queries in a private window and see whether a summary appears, and if so, who is mentioned.

The last item is the most reliable and the hardest to automate. A manual sweep of fifteen target queries once a month shows which competitors get mentioned and which kind of content gets chosen — more instructive than any tool.

Not panic — adaptation

Most of what is written about AI Overviews comes in a tone of catastrophe, and that tone misleads. Coverage grew, but not on every query; clicks fell, but not for every page; and for cited pages the picture reverses.

The healthy response separates two things. Part of the traffic from information-seeking queries will shrink permanently — this is not reversible, and it has to be accepted. In return, being mentioned inside the summary is a new visibility channel, and that channel is not yet crowded.

The practical strategy follows: write informational content not “to bring clicks” but “to be cited and have the brand mentioned,” and move conversion expectations to the query types the summary does not cover — transactional and navigational. Together the two build an arrangement that limits the loss and collects the gain.