1.4) Your First C++ Program: Writing To An Output Stream

This is the relevant program statement:

cout << "Hello World!" << endl;

Explanation

cout is an output stream (an ostream object) representing console output - i.e., the terminal window from which the program was run
<< is the stream insertion operator

The data to be inserted appears on the right
The ostream object to the left is the destination for the data

"Hello World!" is a string of characters; the double-quote character at the start and end is a delimiter and not part of the actual string

endl is a stream manipulator that sends OS-dependent line ending characters to an output stream and then flushes the output buffer so that pending output appears at its destination

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