Authentication

Authorization

Authentication verifies who you are
Authorization verifies what you are authorized to do
Authenticating a user on a website means that you verify that this user is a valid user, that is, verifying who the user is using username/password or certificates, etc
Authorization is the process of verifying if the user has rights/permission to access certain resources or sections of a website,
Example : When u login to access some site then your logon credential (userid/password) identifies
Example : After successful logon, you will be granted specific role or privileges to access the site.