Answer Posted / suresh kumar jetty

Authentication
An authentication system is how you identify yourself to
the computer. The goal behind an authentication system is
to verify that the user is actually who they say they are.
There are many ways of authenticating a user.Like
Password based authentication
Device based authentication
Biometric Authentication

Authorization
Once the system knows who the user is through
authentication, authorization is how the system decides
what the user can do.
A good example of this is using group permissions or the
difference between a normal user and the superuser on a
unix system.

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