Introduction

Introduction

XML stands for Extensible Markup Language.
XML is a software- and hardware-independent tool for carrying information.
XML is a markup language much like HTML.
XML was designed to describe data, not to display data.
XML tags are not predefined. You must define your own tags.
XML is designed to be self-descriptive.
XML is a W3C Recommendation.

 Eg

<note>
  <to>Tove</to>
  <from>Jani</from>
  <heading>Reminder</heading>
  <body>Don't forget me this weekend!</body>
</note>

The tags in the example above (like <to> and <from>) are not defined in any XML standard. These tags are "invented" by the author of the XML document.

That is because the XML language has no predefined tags.