AI Overviews are AI-written summaries that Google shows at the top of some search results, answering the query in a few paragraphs or bullet points with links to the pages it drew on. They grew out of Google’s Search Generative Experience (SGE) trial and replaced it when they launched publicly.
How AI Overviews work
When Google judges that a summary would help, a Gemini model customised for search reads pages from Google’s index and writes an answer. Links to sources appear beside or within the text, and the searcher can expand the overview to see more. Google bases each answer on retrieved pages rather than on the model’s memory alone, a process known as grounding.
Overviews appear mainly for informational and multi-part questions, such as “how long does planning permission take for an extension”, and less often for brand searches or simple shopping queries. The pages cited are frequently among the top organic results, but not always. A page further down can be cited because it answers one part of the question better than anything above it.
Google brought AI Overviews to UK results in 2024. At the time of writing (October 2026) they appear on many UK informational searches, and Google has begun showing ads in and alongside AI Overviews in some markets. Google has said overview appearances are counted in the Search Console Performance report alongside ordinary results, so that report cannot tell you on its own which clicks came from an overview.
Why it matters
When an overview fully answers a question, fewer people click through, which is why many sites have seen click-through rates fall on informational queries while impressions hold steady. That is the core of zero-click search. For a UK business that relied on explainer blog posts for traffic, the change is real.
The other side is that being cited puts your brand in front of the searcher at the top of the page, often above every organic result. Visitors who click from an overview have usually read a summary first, so they tend to arrive with clearer intent.
Accuracy is a further concern. Overviews can misread or merge sources, a form of hallucination, and occasionally state something wrong about a business, a price or a regulation. Checking what overviews say about your own business and sector is worth a few minutes a month.
Common mistakes
- Reading every traffic dip as a penalty. Falling clicks with stable rankings and impressions often point to overviews, not a problem with your site.
- Stuffing pages with question-and-answer blocks. Overviews cite pages that answer well, not pages that repeat questions.
- Using nosnippet to block overviews. It also strips the description from your normal listing, usually costing more than it saves.
- Reporting rankings only. Position one under a large overview is not what it used to be.
How to act on it
Identify your important queries that trigger an overview, by hand or with a rank tracker that records search features. For each, note which sources are cited and compare them with your page. Does yours answer the question in its opening lines? Does it offer something the cited pages do not, such as UK-specific costs, a worked example or first-hand experience?
Improve the pages that should be cited, lead with direct answers under clear headings, and watch click-through rate and impressions for those queries in Search Console over the following months. This is the focus of my AI Overviews optimisation service.