What does the HTTP status code 403 mean and what is its essence when interacting with a server?

HTTP status code 403 means "Forbidden". It indicates that the server understood the client's request but refuses to authorize it due to lack of access rights to the requested resource. Unlike 401 (Unauthorized), where authentication is required, 403 indicates that authentication will not help — access is forbidden by the server's policy.

Example: if a user tries to access an admin page without proper permissions, the server will return 403.

Thus, the essence of 403 is to inform the client that they do not have permission to perform this action or access the resource, despite the request being correct.