These are the fundamental concepts in the security context. In plain language, we can describe it as authentication. Authentication asks the question, "Who are you?" and authorization says "What you can do?" Logging in to any system is a process of authentication. Assigning a role to a user at the time of login whether they are an admin or a normal user is a process of authorization. Access control should be there. Each entity should have minimum access, which is required to do business.