# ID
Scalar

The `ID` scalar type represents a unique identifier, often used to refetch an object or as key for a cache. The ID type appears in a JSON response as a String; however, it is not intended to be human-readable. When expected as an input type, any string (such as `"4"` ) or integer (such as `4` ) input value will be accepted as an ID.

## Usages

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#### References

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- Field externalId from Actor

- Field externalId from Movie

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