Postman has the following variable scopes :
Global Variables : Global variables allow data access between different collections, requests, and scripts. They are available throughout the workspace.
Environment Variables : These allow us to tailor the requests about different development environments - such as local testing, stage testing, or prod testing.
Local Variables : These are temporary variables that are accessible only within the scope of requests scripts. They are either scoped to a single request or single collection, depending on the requirements. These variables are not available after the completion of the script execution.
Collection Variables : These variables are scoped to be available for all the requests present in a collection. They are independent of the environment.
Data Variables : These variables come from external JSON or CSV files for defining the datasets required to run the collection in Collection Runner or Newman.
