std::cout is an object of ostream class that represents the standard output stream oriented to narrow characters (of type char). It corresponds to the C stream stdout. The standard output stream is the default destination of characters determined by the environment. This destination may be shared with more standard objects (such as cerr or clog).
As an object of class ostream, characters can be written to it either as formatted data using the insertion operator (operator<<) or as unformatted data, using member functions such as write. The object is declared in the header <iostream> with external linkage and static duration: The scope lasts the entire duration of the program.

For ex : 
int main() {
   std::cout << "Hello";
   return 0;

Output of the above code snippet : 

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