For example let's look at the Burp method in the Employee class.
Because it's public we can call it from the MainWindow without a problem. As weird as it may seem, we could call the Burp method until the attendant withers away to nothing.
We would like to give control over the Employee's burping to them. To do this we will make the Burp method private.
So now we can't call the Burp method from the MainWindow anymore.
But we can still call the Burp method from within the Employee class.