A simple variable is a variable that can be referred to by its name alone. For example:
var fullName = 'Dusty Arlia';
This is a simple string variable. You know it is a simple variable because you can access it by referencing its name:
fullName. Here is an example of how you can reference a simple variable by name:
Here is an example of an array:
You couldn't reference a value in an array by just using the array's name:
fullNames. For this reason, arrays are not simple variables.