---
title: Query pipeline feature
slug: '234'
canonical_url: https://docs.coveo.com/en/234/
collection: glossary
source_format: adoc
---
# Query pipeline feature
A {doctitle} is a type of [query pipeline](https://docs.coveo.com/en/180/) action (such as filter or thesaurus) or [Coveo Machine Learning (Coveo ML)](https://docs.coveo.com/en/188/) [model](https://docs.coveo.com/en/1012/) association.
These features can be expressed through specific [query pipeline language (QPL)](https://docs.coveo.com/en/235/) syntax in a [query pipeline statement](https://docs.coveo.com/en/236/) definition.