What is the exclamation mark for after the variable?

Question

I'm trying to understand the snipppet from graph ql appollo tutorial. What is the exclamation mark for after the variable? ID!

  query GetLaunchById($id: ID!) {
      launch(id: $id) {
        id
        rocket {
          id
          type
        }
      }
    }

Duplicate of [What is an exclamation point in graphql?](https://stackoverflow.com/questions/50684231/what-is-an-exclamation-point-in-graphql) — Daniel Rearden, Apr 26 '19 at 14:55

score 1 · Accepted Answer · answered Apr 26 '19 at 14:54

1

It means it's non-nullable.

answered Apr 26 '19 at 14:54

Flo

1 Answers1