What is the purpose of an authorization system and why is it necessary in applications?

The authorization system is responsible for determining the user's access rights to application resources after they have been authenticated (identity verification). It is necessary to ensure security so that different users only have access to the functions and data they are permitted to. For example, in a web application, a regular user can view their data, while an administrator can manage all users.

In Go, authorization is often implemented through middleware that checks user tokens or roles before executing a request.