PHP is one of the most popular server-side scripting languages in existence today. The language has the ability to communicate back and forth with a server and create a dynamic web page for the user. If you have a web hosting account to run your personal blog or website, I can guarantee that PHP is already installed. Even the page you are looking at right now was created by PHP. If you have ambitions of becoming a web developer, PHP is a must for you and will allow you to create dynamic web pages based on external input, usually from the user. It is also important to note that PHP is an object-oriented programming language, and O.O.P. is one of the things we will cover in the series.