What is this <iostream>

Answer 1

C++ header file for input and output streams, which provide console input and output functionalities.

Answer 2

It is a header file which contains inbuilt functions for input/output functions in C++.
"cin>>" ; "cout <<" etc are part of this standard library.

Answer 3

it is a library that includes all the functions that deal with the input and output "streams"(cin, cout...)

Answer 4

In the C++ programming language, Input/output library refers to a family of class templates and supporting functions in the C++ Standard Library that implement stream-based input/output capabilities. It is an object-oriented alternative to C's FILE-based streams from the C standard library.