The purpose of this book is to provide an introduction to this set of technologies to teach a new programmer how to get started creating data-driven websites and to provide a jumping-off point for the reader to expand his or her skills. Today's modern world is heavily dependent on the World Wide Web. It affects the way we communicate, how we shop, and how we learn about the world. Every website, every page, consists of four fundamental elements: the structure, the style, the programming, and the data. These correspond to four different "languages," respectively: HTML, CSS, PHP, and MySQL.