#include <iostream>
#include <cstdlib>
i mean those
iostream allows you to use cout, cin, etc.
cstdlib allows you to use system(), exit(), EXIT_SUCCESS, etc.
Basically, when you use the #include statement you are adding the ability to use functions/code which were previously written and are located somewhere else in your system, such as in a separate file or in a library.
iostream and cstdlib are called libraries. They contain many methods/functions that will help you from printing to screen to seeding random numbers to sorting arrays, and many more.
The #<...> is just the syntax for C++. In java the syntax is
import java.SomeLibrary. Each language has is own ways, some similar to others.
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