What is std here? It is getting difficult me to understand.

Answer 1

The standard namespace.

Answer 2

http://www.cplusplus.com/forum/beginner/61121/
This may help you

Answer 3

std is the namespace!It's the default namespace!you can create your own namespaces,remove the
using namespace STD;
and whenever you use cout>> you'll get an error!

Answer 4

std is short form of standard.