What does "iostream" mean and why is it used for?

Answer 1

The <iostream> header defines the standard stream objects that input and output data.

Answer 2

iostream stands for standard input output stream. This header file contains definitions to objects like cin, cout, cerr etc.

Answer 3

Using it you can use std::cin and std::cout for example.

Answer 4

(io)stream: i & o
i: input
o: output

"iostream" means "input & output stream"
From "iostream" you get some tools to handle input and output data. Such as cout, endl, cin and str are from "iosream".

Answer 5

Iostream is a header file that includes function about input and output data
Sometimes you don't need,like your own header files