Just as HTML is used to create visual applications, VoiceXML is a mark up language used to create voice applications. With a traditional webpage, a web browser will make a request to a web server, which in turn will send an HTML document to the browser to be displayed visually to the user. With a voice application, it's the VoiceXML interpreter that sends the request to the web server, which will return a VoiceXML document to be presented as a voice application via a telephone. What makes VoiceXML so powerful is that all of the most popular tools for making webpages are available for making voice applications. Developers can use technologies they are already familiar with like JavaScript, Perl, and JSP to generate exciting new voice applications.