XML, Extensible Markup Language File (.xml)
The XML Document file format
Created in a textual data format, XML is a file type that is not only human readable but is also relevant to web services since it is a machine readable language as well. XML is a platform independent language designed to store various data. With features such as simplicity, usability, and generality, the language is as popular as HTML and is widely distributed over the internet. The fact that XML files can be easily edited by using a simple text editor supports the growing popularity of this file type.
Technical details of XML files
An XML document is a series of characters where every Unicode character may be found in each individual document. The standard encoding of a Unicode that makes up a XML document is divided into markup and content on the basis of simple syntactic rules. It has an advantage over the HTML document by allowing custom tagging of objects to distinctly define the data they are holding.