What does the main function() do?

Hello I just started this course and I am taking the first challenge. I think the main function() is supposed to execute lines of code whenever it is called to do so.

Hello, I´m also completely new at this, but here it goes… I think the main function() is the part where we define how we are going to use the method previously determined. It defines what kind of information we input and what we want the program to do with it, and it also defines the output response. In this case the mf() defines the user interaction with the game in two levels of difficulty.