HTML or HyperText Markup Language is a language for describing documents, in common use on the world wide web.
HTML is an international standard that is maintaned by the W3C – however officially HTML has been succeeded by the XML compliant format XHTML published by the W3C.
Unofficially, HTML 4.01 is the most popular format in use, and although HTML 4 defines stricter syntactic rules than earlier versions, it is not 100% XML compatible like XHTML.
HTML is complemented by two other web technologies, JavaScript, a language for scripting behaviors in web pages and CSS, a language for describing style of how pages are displayed.
Some HTML elements overlap CSS in defining style, however in good practice it is recommended that HTML elements be restricted to either navigational elements (links) or structural markup that describes the meaning of the text to be displayed.
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