Usage of header files

#1

Is it necessary to use all header files which are wanted for the respective code or we can we simply use #include<bits/stdc++.h>. I would like to know what is bits/stdc++

#2

@manikantahariharan434 https://www.geeksforgeeks.org/bitsstdc-h-c/
Refer this article. All your questions are answered here.

#3

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