23 lines
816 B
Markdown
23 lines
816 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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free-pro-team: '*'
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enterprise-server: '*'
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github-ae: '*'
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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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{% for item in graphql.schemaForCurrentVersion.unions %}
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{% include graphql-union %}
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{% endfor %}
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