Enum

Enums are simple constructs that allow you to define a set of named values.

enum Role {
    USER
    ADMIN
}

They can be used to type model fields:

model User {
    id   Int  @id
    role Role @default(USER)
}

Enum field names are added to the global scope and are resolved without qualification. You need to make sure they don't collide with other global names.