XSL (eXstensible Stylesheet Language) is the styling language to match XML. At the most basic level it allows the programmer to manipulate XML on a template model -- XSL provides the template to fit XML data into for displaying on a web page. However, it is capable of much more than that, and allows programmers to selectively query, display and manipulate data, perform scripting-like operations on the XML document and transform it into pure HTML for use on browsers which don't support XML.