In the previous chapter we have seen that writeln takes a string within parentheses and prints the string.
The parts of programs that actually do work are called functions and the information that they need to complete their work are called parameters. The act of giving such information to functions is called passing parameter values to them. Parameters are passed to functions within parentheses, separated by commas.
Note: The word parameter describes the information that is passed to a function at the conceptual level. The concrete information that is actually passed during the execution of the program is called an argument. Although not technically the same, these terms are sometimes used interchangably in the software industry.