metadata
title: Unions
intro: A union is a type of object representing many objects.
redirect_from:
- /v4/union
- /v4/reference/union
versions:
fpt: '*'
ghec: '*'
ghes: '*'
topics:
- API
autogenerated: graphql
About unions
A union is a type of object representing many objects.
For example, a field marked as an ProjectCardItem could be an Issue or a PullRequest because each of those objects can be inside a project card. Using a union instead of an object gives you flexibility.
For more information, see AUTOTITLE.