What is an exclamation point (!) in GraphQL?

In GraphQL, an exclamation point (!) indicates that a field in a query or a field argument is non-nullable. This means that the field must contain a value and cannot be empty. When used with a field, it ensures that the server always returns a value that is not null. When used with a field argument, it indicates that the client must provide the argument and it cannot be left out.

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