Modern web technologies allow web pages to be used as full-featured applications to replace traditional programs. The most important of these is AJAX, which allows a page to communicate with the server and dynamically alter web page elements. In this chapter, you will learn the basics of web development by creating a simple web page, changing its visual appearance, and making it interactive. Then, you will learn how a web server can serve dynamic pages generated by Python, before putting all of these skills together to create a media player and radio station that you can access from anywhere. We will cover the following topics in this chapter: