AAA explained

Triple-A, or AAA, stands for Authentication, Authorization, and Accounting. Initially, this term was invented as a term to describe the security network protocol; however, it can be easily applied to any system, web resource, or site.

So, what does AAA mean and why should we bother?

Authentication is the process of uniquely identifying the users of a system. An authenticated user is a user whose access to a system is granted. Usually, the authentication is done via some username and password. When you have to provide your username and password to open your Facebook page, you are authenticating yourself.

Your passport is a way of authenticating yourself at the airport. The passport control agent will look at your face and then check your passport. So anything that allows you to pass is a part of your authentication. It can be a special word (password) that is only known by you and the system or it can be something that you port (passport) with you that can help the system to...