What is XML?
XML, or Extensible Markup Language, is a markup language that you can use to create your own tags. It was created by the World Wide Web Consortium (W3C) to overcome the limitations of HTML, the Hypertext Markup Language that is the basis for all Web pages. Like HTML, XML is based on SGML -- Standard Generalized Markup Language. Although SGML has been used in the publishing industry for decades, its perceived complexity intimidated many people that otherwise might have used it (SGML also stands for "Sounds great, maybe later"). XML was designed with the Web in mind.