Some languages are traditional programming languages for developing applications; others, such as markup and scripting languages like html, xhtml, and are designed to be used to create web pages.

XML (Extensible Markup Language):

Explanation:

XML (Xtensible Markup Language):

It is a markup language that is used for creating web-pages, it defines a set of rules that makes it readable both to humans and machine.

XML was primarily designed to be a software and hardware independent tool and it's focus was on data.  XML provides a framework for defining markup languages.

XML, HTML and XHTML are all related to each other because they are all markup languages and can be used to build websites.

Basically,

-HTML is primarily for web-pages.

-XML is primarily for data.

-XHTML is a standard based on HTML that follows the strict rules of XML.

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