Knowledge base v2.13.0 · Community edition · data through 2 October 2026
Thing · Concept
How Google interprets a query (spelling, synonyms, language, intent) before it retrieves results.
Glossary · Query understanding
The first serving step: Google detects a query's language, separates its words, drops stop words where they matter little, recognises entities and expands the query with synonyms before looking it up. Google said it rewrites pretty much every query.
Slide and stage claims that name it, the ones Google’s documentation does not cover first.
Google named Thai as a language that makes query understanding more complex because it does not separate words with spaces; the speaker added, hedging with 'apparently', that Thai uses spaces to separate sentences.
John Mueller · Day 3 · Making sense of users' queries
Google's summary slide on query understanding said Google's synonyms are not always language-based; on stage this was explained as words people use interchangeably counting as synonyms even when they are not synonyms linguistically.
John Mueller · Day 3 · Making sense of users' queries
Google's summary slide on query understanding noted that some languages do not use spaces between words, which complicates query understanding.
John Mueller · Day 3 · Making sense of users' queries
At retrieval, Google splits the query into words, applies query understanding and expansion, and matches the words and their expansions against the posting lists.
Gary Illyes · Day 3 · Making sense of users' queries
Google's opening slide for serving day showed serving as the third stage after crawling and indexing, and drew Google's serving infrastructure as query understanding and retrieval leading into the index, then ranking and search features leading back to the user, for the example query 'Where to eat jamon'.
Google placed query understanding in the traditional part of Search, the part where answers are looked up in an index and then presented and ranked.
John Mueller · Day 3 · Making sense of users' queries
Google's generative AI features in Search build on the traditional ways of searching, so query understanding also flows into AI Overviews and AI Mode.
John Mueller · Day 3 · Making sense of users' queries
Every fan-out query goes through Google's query understanding, including synonym expansion.
John Mueller · Day 3 · Making sense of users' queries
Google's summary slide on query understanding told site owners not to worry about typos and plurals, which Google rewrites automatically.
John Mueller · Day 3 · Making sense of users' queries
Google's summary slide on query understanding said query fan-out does even more expansion than synonym expansion.
John Mueller · Day 3 · Making sense of users' queries
After query understanding and expansion, Google sends the queries to the index to look up pages, the retrieval step.
John Mueller · Day 3 · Making sense of users' queries
Which kinds of results Google shows for a query is decided by query understanding, which tries to predict the intent behind the query.
Google's serving diagram shows the query passing through query understanding and retrieval to the index, then back through ranking and search features to the user, with the Search Features step highlighted (example query 'Where to eat orange').
Behind the visible attributes, small pieces of product data such as brand and UPC or other barcodes are very important for Google Shopping's query understanding, retrieval and ranking.
Alex Jansen · Day 3 · Shopping on Search: Beyond the blue links
Google's summary slide on query understanding said that synonyms are expanded automatically.
John Mueller · Day 3 · Making sense of users' queries
Google's query understanding talk set out to show how the changes Google makes to users' queries relate to what a website can provide.
John Mueller · Day 3 · Making sense of users' queries
Google's summary slide on query understanding concluded that all this query expansion gives site owners many opportunities for their content to be found and shown.
John Mueller · Day 3 · Making sense of users' queries
Kit items about Query understanding: their own words name it, or several of the claims they rest on do.
Also inglossary terms Retrieval, Query fan-out, Query understanding
Things named in the same claim, with the number of claims they share.