HyperText Markup Language (HTML) is the language behind most Web pages. The language is made up of elements that describe the structure and format of the content on a Web page.
HTML is maintained by the World Wide Web Consortium (W3C). As of this writing, the latest versions are HTML 4.01 and XHTML 1.0. See http://www.w3.org/TR/html4/ and http://www.w3.org/TR/xhtml1/ for the specifications. In this lesson, we will address the differences between HTML and XHTML and discuss the effect of HTML5.