what does the "endl" means

Answer 1

endl is short for "end line", and sets the cursor on the next line.
You can also use \n (the escape character for a new line) after the text your printing instead.
Ex:
cout << "Using endl" << endl;
//is the same as
cout << Using newline\n";

Answer 2

c++ language does not understand spaces , so to change the line or make difference between two lines you use it
eg: cout<<"any text"endl;
cout<<"any text";

Answer 3

the c ++ can't use to new line to new character than we use endl ( a short form of end line) to use new line to new text