Web pages are composed of files containing Hypertext Markup Language (HTML) and other markup languages that describe Web pages. HTML was developed using Standard Generalized Markup Language (SGML). SGML prescribes a standard format for embedding descriptive markup within a document and for describing the structure of a document. SGML is not in itself a document language, but rather a description of how to specify one and create a document type definition (DTD).
HTML is the set of markup symbols or codes placed in a file intended for display on a Web browser page. The purpose of markup symbols is to identify structural elements such as paragraphs, headings, and lists as well as place media and describe fill-in forms. The browser interprets the markup code and renders the page. HTML permits the platform independent display of information across a network.
