"Authentication is the process in which a program determines
whether a user is actually the person who he claims to be. It is
used in any kind of a system that provides different services to
people depending upon their membership. When you log in to your
favorite mailbox, access ATM, or use the services of Net Banking;
what you are actually doing is obtaining service from the service
provider after proving your credibility using your credentials
(i.e. generally your user name and password).
"Authorization is the process of determining which services you
can access based on your membership level..."