Query fan-out
Definition
Query fan-out is a set of concurrent, related queries generated by a model to request more information and fetch additional relevant search results for one original question.1
- Topic
- AI search
- Updated
- Written by
- By Sergey Sulimko, Founder
Google Search is the source that defines the term in its generative AI guidance. In Google's AI Mode description, the mechanism is plain: the system breaks a question into subtopics and issues many queries at the same time, so Search can investigate the web more deeply than a traditional search.2
Traditional search is the nearest contrast in Google's description: AI Mode's query fan-out can investigate the web more deeply than a traditional search on Google.2
For example, Google illustrates one question about fixing a lawn full of weeds with 3 related fan-out queries about herbicides, removing weeds without chemicals, and preventing weeds. The arithmetic is 1 original question → 3 example subqueries. The example shows a broad question represented by narrower related searches.1
A simple local illustration is a person asking, “Which dentist near me offers a Saturday emergency appointment?” Related searches could examine appointment availability, service type, and location before the experience assembles an answer. This illustrates the mechanism, not the exact subqueries Google will issue.
For local search, query fan-out describes how an AI Search experience may gather related information around a local question.1,2 Google says generative AI responses can include information about local businesses and that Google Business Profiles can help products and services become visible in AI responses and other Search results, where appropriate and without a promise of inclusion or placement.1 Google's AI Mode announcement names local appointments as an initial use case for looking across sites.2 The AI Overviews and clicks research and AI Overviews in local search statistics cover adjacent evidence about those surfaces.
Google says to focus on what users want and avoid creating separate pages for every possible variation, including fan-out queries, when the primary purpose is to manipulate rankings or generative AI responses. That practice violates Google's scaled content abuse spam policy. The guidance also says its systems can understand relevance even without an exact match between a query and a page's primary content, and that meeting requirements, best practices, and policies does not guarantee that a page will be crawled, indexed, or served.1
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