Since its evolution in 1994, the most impressive web developer language VRML has been through a lots of modifications and upgrades. In the year 1997, VRML was upgraded for the first time and its name was changed from VRML94 to VRML97 (which is also known as VRML2 or VRML 2.0).
Since its evolution, the HTML (Hyper Text Markup Language) has been revised and upgraded a number of times in order to make the World Wide Web a better place to live virtually. HTML is a derivative of SGML (Standard Generalized Markup Language), but its major flaw is that it is not extensible.
HTML can be classified into two categories namely SGML based HTML (traditional) pitted against XML based HTML (also called XHTML) and the second one being a strict versus transitional versus frameset.