While most people learning to make websites have probably heard the term PHP thrown around before, you may not actually know what PHP is. PHP is an easy to learn programing language that can be run on your website to add more dynamic features. Unlike some types of programing, PHP was designed to work with HTML so you can interchange between the two within the same document. This allows a lot of flexibility when integrating PHP into already existing HTML pages.

So what exactly do I mean by dynamic? What I mean is that it enables your web pages to make choices based on user input, and then output the appropriate content or perform any necessary calculations. One simple example of this I've seen a lot lately is mortgage companies that can give instant quotes. A form could collect the loan amount and down payment and PHP could calculate and instantly show what a monthly payment would be for different interest amounts.