What Is Query Fan-Out & Why Does It Matter? [Answered]
Query fan-out is the process of sending a single query to multiple systems or data sources simultaneously to gather results faster. It improves performance and coverage but can increase system load and complexity in managing responses.
Semrush contributor Rachel Handley has published an article answering the question, ‘What Is Query Fan-Out & Why Does It Matter?’.
She says, “Google popularized the term “query fan-out” when introducing Google AI Mode, a conversational AI interface available within Google Search.
In the Google I/O 2025 keynote speech, Head of Search Elizabeth Reid said: “AI Mode isn’t just giving you information—it’s bringing a whole new level of intelligence to search. What makes this possible is something we call our query fan-out technique.
“Now, under the hood, Search recognizes when a question needs advanced reasoning. It calls on our custom version of Gemini to break the question into different subtopics, and it issues a multitude of queries simultaneously on your behalf.”
When you search in Google AI Mode, you might see the model run multiple web searches as part of its reasoning process.”
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