source code to authenticate hospital data with login password and needs to check whether the given details are valid or not code example

Example: what is authentication

Authentication is the process of recognizing a user’s identity. 
 It is the mechanism of associating an incoming request 
 with a set of identifying credentials. 
 credentials provided are compared to those on a file 
 in a database of the authorized user’s information 
 on a local operating system 
 or within an authentication server.