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What is XML and what is it used for?
XML stands for extensible Markup Language
XML is a markup language much like HTML
XML was designed to store and transport data
XML was designed to be self-descriptive
XML Does Not DO Anything in reality

Maybe it is a little hard to understand, but XML does not DO anything.
The Difference Between XML and HTML
XML and HTML were designed with different mission:
XML was designed to carry data it describes data

HTML was designed to display data it focus on how data looks
XML tags are not predefined like HTML tags are xml Does Not Use Predefined Tags
while HTML works with predefined tags

with XML, the author must define both the tags and the document structure.

XML Simplifies Things

It simplifies data sharing
It simplifies data transport
It simplifies platform changes
It simplifies data availability
that is all you should know about Xml .