What is a Markup Language?
A markup language lets you name the various elements in your text: HTML is the most famous markup language. You just insert special codes called tags into your text; these tags tell you where each interesting element starts or finishes. The term markup was coined by Dr Charles Goldfarb at IBM in the early 1970s. Goldfarb invented SGML, the Standard Generalized Markup Language (Internation Standard 8879:1986) which is now becoming available over the WWW as XML, the Extensible Markup Language.