cout

The "cout" is an output stream object used to send data to the standard output device, usually the console. It is part of the C++ Standard Library.

Example:

#include <iostream>
using namespace std;

int main() {
  cout << "Hello, world!";
  return 0;
}

Explanation: - #include <iostream>: This line includes the iostream library, which contains the definition for the "cout" object. - using namespace std;: This line allows us to use elements of the "std" namespace without prefixing them with "std::". - cout << "Hello, world!";: This line sends the string "Hello, world!" to the standard output. The "<<" operator is used to insert data into the "cout" object. - return 0;: This line indicates that the program executed successfully and returns 0 to the operating system.