Name the different Web markup languages and explain the differences between them.

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The different Web markup languages include:

• Standard Generalized Markup Language (SGML): This language was developed to help very large organizations format and categorize large collections of documents. It is very complicated, hard to learn, and was not widely adopted.

• Hypertext Markup Language (HTML): This relatively easy-to-learn language consists of a set of tags that are used to instruct the Web browser how to display a Web page. It defines the structure and style for a document including the headings, positioning of the graphics on the page, construction of tables, and the formatting of text.

• eXtensible Markup Language (XML): This is a markup language that, instead of functioning to format the style and page layout for a Web page, sets out to describe the data on the page. Tags such as <name> and <address> are used to describe and display data according to the user’s definitions. It is extensible because new tags can be continually defined to transform data into new formats, in contrast to HTML that has only a set number of predefined tags. 

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