Authentication is process which confirm the identification of user and client at web login time, We can also say that is a function which is matched the entered details with database record if database information is matched with login user name and password is same as then we are successfully moved in Authenticate Mode called verified process. All the web developments are mostly used Authentication code to verified a particular user in login process. For example if we have an Computer password then we can easily login to the system because this ,password is also stored is system Administrator database which give permission to user access this Operating system.