# Synthetic Query

> Source: https://rankxai.com/glossary/synthetic-query · Last updated: 2026-08-18

A synthetic query is a search an engine writes itself, generated from a user’s question rather than typed by anyone. Synthetic queries are the searches actually run behind an AI answer, and the page that gets cited matched one of them rather than the question the reader asked.

## Where do synthetic queries come from?

From the decomposition step Google calls [query fan-out](/glossary/query-fan-out). Announcing AI Mode on 20 May 2025, Google described it as “breaking down your question into subtopics and issuing a multitude of queries simultaneously on your behalf”, and Search Central now describes AI Overviews the same way. Each of those issued searches is synthetic: nobody typed it, and it exists only inside that one answer.

They tend to carry qualifiers a person would leave implicit. Comparisons, price ranges, locations, the current year and words like “best” or “reviews” appear in generated searches far more consistently than in typed ones, because the engine is trying to cover an intent rather than express one. That is why keyword tools and answer engines disagree about what a topic contains. A tool reports what people typed; a fan-out reports what an engine decided the question implied, and the second list is longer, more commercial and mostly absent from any volume table.

## Why can you not simply target them?

Because they are not stable and mostly not observable. The same prompt fans out differently between runs, and only some platforms return their searches at all: Perplexity exposes a `search_queries` field, and Google’s Gemini grounding API returns a `google_search_call` block. Everything else is inference from the answer text and the sources it cited.

So a tool showing you a tidy list of the sub-queries behind an answer is either reading a returned field or reconstructing them with a second model, and the difference between those two is the difference between evidence and a hypothesis. Ask which it is.

## What should you do about a query space you cannot see?

Cover it rather than target it. Every adjacent question a page answers completely is a synthetic query it can match; every one it leaves out is a synthetic query answered by somebody else’s page inside the same response. That is an argument for a section per sub-intent, phrased as the question, and against a longer treatment of the head term.

There is one visible proxy worth using while the real thing stays hidden. People Also Ask shows a set of questions Google associates with a query, for free, on every results page, and while those are not the searches an AI Overview issued they are generated by the same association. Treat them as research rather than as the fan-out itself, and the distinction stays honest.

## Sources

- [Google: AI Mode announcement, 20 May 2025](https://blog.google/products/search/google-search-ai-mode-update/), checked 2026-08-18
- [Google: Grounding with Google Search, Gemini API documentation](https://ai.google.dev/gemini-api/docs/grounding), checked 2026-08-18