What is abstraction in c# or in other languages?

Question

Can someone give concrete explanation about abstraction. I keep reading it but always not clear enough.

Answer 1

Abstraction means showing only essentials features of program by hiding non essential coding in back.
eg.
You might be seeing my comment right now, aren't you? Can you see that it is a expandable textarea with a grey border at the bottom?
Abstraction is simply a method of hiding the coding and showing what people actually wants to see (i.e. the output, not the input/coding)...