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XML can simply be described as a way two or more information systems can interchange data.
The sytems may be sending or receiving across the Web.
The information exchanged can be a single word, a database record, documents, graphics and even complex software objects used programmers, in fact anything that can be described with XML.
XML is text, but it is structured text, structured in such a way that it not only carries information, but information about information. This "additional" information is called meta-data and like all the information an XML contains is also contained between a pair of < > characters.
Quite often the text information an XML document was created to contain can be values that have units e.g. length (distance) which could be in meters, feet, miles or light years, we only know because the meta-data tells us which units apply to a particular
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