Authentication versus Authorization

Question

What is the difference in terms of web application? And what does "auth" stands for does it mean authentication or authorization or both?

Answer 1

Authentication is basically used to find are you really the person who you claim to be with the help of login and password

Whereas Authorization is used to determine which level of permissions you have like to determine whether you have admin access or developer access  

For example: If you want to access the database server

you should first know who is trying to access it

Then you should know what kind of access they have like do they have access to edit, create, update or delete

Auth can mean either, but is used more often as "User Auth" i.e. "User Authentication"