Calling a function means you are using the function (as opposed to defining a function which only tells us what the function can do)
To call a function you simply write function name followed by parentheses (don’t forget the parentheses!)
Now you can call this function as many times as you want
// define / declare a function named shout()
// by itself this doesn't do anything, we must "Call" it
// in order to use it
function shout() {
alert("HELLO!");
}
// Calling the function named shout
// we call a function by writing the name
// of the function followed by parentheses
shout();