Standard library means what?

Question

I am a beginner so I don't know a thing

Answer 1

so is it set of functions?

Answer 2

#include <iostream> This is the standard library. It includes all standard things like cin, cout, if functions and so on.

Answer 3

No. (as example)For the switch() function you must include the <cstdlib> library. switch is like several if functions.