HTML (Hypertext Markup Language)
HTML (Hypertext Markup Language) is the set of markup symbols or codes inserted in a file intended for display on a World Wide Web browser page.
The markup tells the Web browser how to display a Web page's words and images for the user.
Each individual markup code is referred to as an element (but many people also refer to it as a tag).
Some elements come in pairs that indicate when some display effect is to begin and when it is to end.
HTML is a formal Recommendation by the World Wide Web Consortium (W3C) and is generally adhered to by the major browsers, Microsoft's Internet Explorer and Netscape's Navigator, which also provide some additional non-standard codes.
The current version of HTML is HTML 4.0. However, both Internet Explorer and Netscape implement some features differently and provide non-standard extensions.
Web developers using the more advanced features of HTML 4 may have to design pages for both browsers and send out the appropriate version to a user.
Significant features in HTML 4 are sometimes described in general as dynamic HTML. What is sometimes referred to as HTML 5 is an extensible form of HTML called Extensible Hypertext Markup Language (XHTML).