What is the difference between authentication and authorization in web testing?

The differences between authentication and authorization are:

• Authentication is the process with which the system identifies the user whereas authorization is the process after the authentication process.

• The authentication is used to ensure that the user is indeed a user, who he claims to be whereas in authorization system will decide whether a particular task can be performed by the user.

• There are different types of authentications, which can be used like password based authentication, device based authentication whereas in authorization there are two types read only, and read write both.