what is meant by abstraction? and why it is used or when to use?

Answer 1

abstraction means hiding some functionality of a process from the user.When you try logging in on Facebook,you enter your username abd password.During this,so many things happen that are unknown to you.All you see is if the log in was successful or not,not sure if this was a good example

Answer 2

Abstraction is used to help hide vital processes from a user that could disclose vulnerable information, so the user doesn't actually see what happens

Answer 3

then what will encapsulation do?