Query fan-out: writing for the questions behind the question
Query fan-out is how AI search breaks one question into several related searches, then combines the results. Google described it publicly for AI Mode in 2025. For publishers it changes the unit of competition: you are no longer competing only for the question people type, but for each of the smaller questions hidden inside it.
On this page — 5 sections
What is query fan-out?
Quick answer
Query fan-out is a technique where the search system splits a question into sub-topics, runs a separate search for each, and builds one answer from the results. Google has said AI Mode and AI Overviews use it to go deeper than a single search would.
At Google I/O 2025, Google explained that AI Mode uses query fan-out: it breaks a question into subtopics and issues many queries at once on the user's behalf. The answer then draws on pages found for each of those queries. Ask "is it worth installing solar panels on a house in Riyadh?" and the system may search separately for installation cost, payback period, net metering rules, panel performance in heat and dust, and maintenance.
Each of those sub-searches has its own winners. The page cited for "payback period" may be different from the page cited for "dust and panel efficiency".
Why does fan-out change how you plan content?
Quick answer
Because each sub-question becomes its own chance to be cited. A site that answers every important sub-question of its topic clearly gets cited more often than a site with one long page that answers the main question vaguely. Coverage of the sub-questions is what counts.
Fan-out rewards the same thing topical coverage always rewarded, but more visibly. If your solar company's site answers cost, payback, rules, heat, dust and maintenance well, you can be cited five times in one answer. If it only has a sales page, you compete for none of them.
It also punishes vagueness. A sub-search for "net metering rules in Saudi Arabia" needs a page that states the rule and its source. A sentence like "regulations may apply" cannot be cited for anything.
How do you find the sub-questions?
Quick answer
Combine sources: People Also Ask boxes, autocomplete, the questions customers ask your sales team, competitor headings, and asking an AI assistant to list what it would need to know. Then group them by meaning, and check which ones already return the same results.
- People Also Ask and autocomplete: search the main question in the target country and language, and record the follow-up questions Google suggests.
- Your own customers: the questions your call center or WhatsApp line gets every week are the most valuable list you have.
- Competitor headings: the H2s on the top pages show which sub-questions others already cover.
- An AI assistant: ask it what someone would need to know to answer the main question. Treat the list as ideas to check, not facts.
- Group and test: merge questions that mean the same thing, then compare their search results. Questions that share most results belong on one page.
Should each sub-question get its own page?
Quick answer
Only when it is searched on its own, has different results, and needs a different kind of answer. Otherwise it belongs as a clearly headed section on an existing page. Too many small pages create thin content and compete with each other.
Fan-out tempts teams to publish a page per sub-question. That usually backfires. Most sub-questions are better served as a section with a question heading and a direct answer, inside a stronger page. A section can be cited just as well as a page.
| Sub-question | Own page? | Why |
|---|---|---|
| Solar installation cost in Riyadh | Yes | Searched on its own, commercial intent, needs a price table |
| Payback period for home solar | Section | Shares most results with the cost page |
| Net metering rules in Saudi Arabia | Yes | Different results, regulatory answer with sources |
| Do panels work in dust storms? | Section | Short answer that fits on the maintenance page |
How do you write sections that fan-out can use?
Quick answer
Give each sub-question a heading phrased as the question, answer it in the first one or two sentences, add the specific facts and source, and keep the section self-contained so it still makes sense when quoted alone, away from the rest of the page.
A fan-out search may land on your page for one section only. Write each section as if it will be read alone:
- Question heading: "How long does a home solar system take to pay back in Riyadh?"
- Answer first: the range and what moves it, in the first sentence.
- Specifics and source: the figures you used and where they came from, marked as an example when they are illustrative.
- No "as mentioned above": repeat the key noun instead of relying on earlier paragraphs.
This article is part of the Semantic SEO series — Writing for meaning: entities, definitions, attribute-value facts, semantic distance and pages that actually answer.
About the author
Mohamed Youns
Semantic SEO Engineer · Author & system developer
Mohamed Youns writes about how search engines understand content — the same standards he applies when building semantic systems at Nut Hub. nut-hub.org