SERP (Search Engine Results Page)

A SERP — search engine results page — is the page a search engine returns for one query. It is the whole page, not one listing on it: ranked links, whatever the engine has generated above them, and everything else the engine chose to show.

This library argues about results pages on 15 of its own pages and has never defined the term [our data]. The word is worth an entry now for one reason: what a results page contains changed, and two metrics that used to move together stopped.

What is on a search engine results page?

Ranked links to pages, each with an engine-selected excerpt, plus whatever generated material the engine adds. On Google, its own documentation puts AI Overviews and AI Mode on that page as surfaces of Search rather than as separate products (Google, AI features and your website).

The vocabulary around the page is loose enough to cause real confusion, so here is the disambiguation:

Results pages are engine-specific, and each engine publishes its own account of how pages qualify to appear on one — Microsoft's is the Bing Webmaster Guidelines. There is no universal results page, and no universal rule for getting onto one.

Is a generated answer part of the results page?

On Google, yes. Its user documentation describes an AI Overview as appearing in Search when its systems determine a generative response is especially helpful (Google, AI Overviews help), and its publisher documentation ties eligibility for those surfaces to a page being indexed and snippet-eligible.

That is the structural fact underneath most AI-search anxiety. The generated answer did not replace the results page; it was added to it, above the links, drawing on the same indexed pages the links point at. What an Overview is and when Google shows one is covered at what a Google AI Overview actually is.

Why did position and clicks stop moving together?

Because the page can now answer the query in place. A result can hold its position while the visit it used to earn is absorbed by the material above it — Ahrefs measured a 34.5% relative CTR decline for top-ranking pages when an AI Overview appeared on the results page, in March 2025 (Ahrefs).

Position and clicks were never the same measurement, but they used to be close enough to read as one. They are not any more, and a report that treats a stable average position as evidence of stable traffic will be wrong in a specific, repeatable direction. The full reconciliation of the click studies, which disagree on magnitude, lives at zero-click search, with the numbers reconciled, and the metric itself is defined at click-through rate.

What can a publisher control on a results page?

The page the results page draws from, and almost nothing else. The engine decides which pages appear, in what order, and which sentences it excerpts. Every documented control is subtractive: the directives Google publishes limit or remove the excerpt rather than dictate it, which is worked through at snippet.

The practical consequence is unglamorous. There is no results-page lever — there is a page, and the results page is a rendering of what the engine made of it. Anyone selling control over the results page itself is selling something that does not exist.

How do we read results-page data?

As two readings, never one. Position data and click data are kept as separate series, and the presence of an AI surface on a given query is established only by looking at the live results page on a dated check — no console we use reports AI Overview presence as a dimension. The one documented AI Overview citation we have, on our insurance build, was confirmed that way [our data].

That is a slower method than it sounds like it should be, and the honest version of it says so: a manual check tells you what one results page looked like on one date, for one query, from one location. It does not generalize, and a single check is not evidence of anything on its own. The wider argument for why this surface is worth measuring at all is in our operator's guide to generative engine optimization.