Scalars are primitive values:
When calling the GraphQL API, you must specify nested subfields until you return only scalars.
Boolean scalar type represents
Float scalar type represents signed double-precision fractional values as specified by IEEE 754.
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.
Int scalar type represents non-fractional signed whole numeric values. Int can represent values between -(2^31) and 2^31 - 1.
Stringscalar type represents textual data, represented as UTF-8 character sequences. The String type is most often used by GraphQL to represent free-form human-readable text.