Another advantage of utilizing the var statement is that we can define numerous variables at the same time. So, if we know we will have multiple different variables, we can use a comma separated list to define them all at once. For example, if we make var x equals four, y equals five, and z equals blue and press return. We now have three variables, one of which is x, which is four. y, which equals five, and z, which equals blue.
We can create variables that do not have any content. We can say var empty and hit return. The variables will be undefined. It also indicates that the variable exists, however, it is empty or undefined. There is nothing assigned to it, so if we were to call back empty, we will see that it is still undefined. Nonetheless, it shows us that it is there, but we need to put something inside it.