---
title: Query function
slug: '232'
canonical_url: https://docs.coveo.com/en/232/
collection: glossary
source_format: adoc
---
# Query function
A {doctitle} is a mathematical expression which is evaluated against each [item](https://docs.coveo.com/en/210/) returned by a [query](https://docs.coveo.com/en/231/).
Its output is stored in a dynamic, temporary [field](https://docs.coveo.com/en/200/) which is generated at query time.