Thread: c++ definitions and explanations help

the beginner tut. tells me some defintions and reasons of some stuff inside the code

Code:

#include <iostream>

using namespace std;

int main()
{
    cout<<"Hello,World!\n";
    cin.get();
    
}

But i was wondering what the std in namespace has to do w/ anything. i left it out and tried to compile it, but i got an error i didn't understand. so could someone tell me what the std is actually for and why it's needed? and maybe the difference between adding the code

Code:

return 1

and not adding it? thanks!