This again, is a program written in the PHP language. We won't worry about the PHP program details this time. Just think of it as a black box that requires input from the user. In this case the input is collected from three form elements. These are called radio buttons.
Radio buttons allow the user to choose one choice out of many.
In this example, the element is called color. They are either checked or unchecked. In the next section, we will finish up this tutorial with a discussion of meta-tags and what you can do if you want to go further.