what is define( function ) in javascript code example

Example 1: function javascript

var x = myFunction(4, 3);     // Function is called, return value will end up in x

function myFunction(a, b) {
    return a * b;             // Function returns the product of a and b
}

Example 2: javascript function

function myFunction(p1, p2) {

    return p1 * p2;  
//  The function returns the product of p1 and p2

}