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XML is a markup language same as HTML. XML tag you can define your self for storing data. XML store (describe) data, nothing more (either temporary or permanent). XML was designed for describing well formed data. Also XML have some strict rules. That rules follow every XML document.
Short for Extensible Markup Language, a specification developed by the W3C. XML is a pared-down version of SGML, designed especially for Web documents. It allows designers to create their own customized tags, enabling the definition, transmission, validation, and interpretation of data between applications and between organizations.