Extensible Markup Language (XML) is a data format standardized by the World Wide Web Consortium. XML is a simple, very flexible text format derived from SGML (Standard Generalized Markup Language). Originally designed to meet the challenges of large-scale electronic publishing, XML is also playing an increasingly important role in the exchange of a wide variety of data on the Web and in applications development. In fact, for as long as computers have been around, programmers have been trying to find ways to exchange information between different computer programs. An early attempt to combine a universally interchangeable data format with rich information storage capabilities was SGML.

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