define XML (Extensible Markup Language)

Definition:

Extensible Markup Language is a simple, very flexible text format derived from SGML, used to make it easy to syndicate or format information using technologies such as RSS.

Example:

<glossary>
<category>
Acronyms
<term>
SEO
<definition>
This is the process of editing a web site’s content and code in order to improve visibility within one or more search engines. When this term is used to describe an individual, it stands for “Search Engine Optimizer” or one who performs SEO.
</definition>
</term>
</category>
</glossary>