eXtensible Markup Language (XML)

is a standard which defines the syntax for document markup. (See also the Markdown language.)

XML can be used by all sorts of documents, including:

• Web pages,
• Vector graphics,
• Legal documents,
• word processor documents,
• real estate listings, etc

XML understood by a variety of platforms:`

• desktop machines,
• mobile phones,
• games machines, etc

XML can be used to communicate between computing platforms

Many libraries for programmers to use

References: XML content mostly from a guest lecture by Eric McCreath