3e998f61d5
Co-authored-by: Laura Coursen <lecoursen@github.com> Co-authored-by: mchammer01 <42146119+mchammer01@users.noreply.github.com>
26 lines
822 B
Markdown
26 lines
822 B
Markdown
---
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title: Unions
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redirect_from:
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- /v4/union
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- /v4/reference/union
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versions:
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fpt: '*'
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ghec: '*'
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ghes: '*'
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ghae: '*'
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topics:
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- API
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---
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## About unions
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A [union](https://graphql.github.io/graphql-spec/June2018/#sec-Unions) is a type of object representing many objects.
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For example, a field marked as an [`ProjectCardItem`](/graphql/reference/unions#projectcarditem) could be an [`Issue`](/graphql/reference/objects#issue) or a [`PullRequest`](/graphql/reference/objects#pullrequest) because each of those objects can be inside a project card. Using a union instead of an object gives you flexibility.
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For more information, see "[Introduction to GraphQL](/graphql/guides/introduction-to-graphql)."
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{% data reusables.projects.graphql-ghes %}
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<!-- Content after this section is automatically generated -->
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