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Explain the Importance of XML in Web Applications.

Extensible Markup Language or XML is a structure, tag-based language which is primarily user for transferring data. Information in XML are both human and machine readable. Tags and attributes, as in HTML is also used in XML but in a slightly stricter way than HTML. Beside that, user or developer can create his/her own tags in XML which can not be done HTML, and that is why it is called EXTENSIBLE.