How do you understand about Authentication and Authorization?

Authentication is the process of proving that a person is Who they say they are.

For example, When you want to access a computer or device, you'll encounter a similar type of authentication. You may get asked to enter a username and password. The username states who you are, but by itself isn't enough to grant you access. When combined with the password, which only that user should know, it allows access to your systems.

Authorization is the process of identifying a person What they're allowed to see and touch

For example, suppose you want to spend the night in a hotel. The first thing you'll do is go to reception to start the "authentication process". After the receptionist has verified who you are, you're given a keycard and can go to your room. Think of the keycard as the authorization process. The keycard will only let you open the doors and elevators you're permitted to access, such as for your hotel room.