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XML = eXtensible Markup Language
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XML is a subset of SGML -- Standard Generalized Markup Language, but unlike the latter, XML is specifically designed for the web
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XML is used to define logical document structure
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XML is not backward compatible with HTML, but the two coexist quite elegantly
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XML can be thought of as an ASCII version of a database
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XML can be used as an object IDL to access databases or any objects and so give web HTML templates to access web-linked databases / backend services
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XML can be used as inter object data (serialization) format for any object model
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XHTML is HTML4 written in XML syntax
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