HTML is a subset of SGML which is stand for Standard Generalized Mark-up Language. A mark-up language alters the presentation of the content of a document. The coded format language used for creating hypertext documents on the World Wide Web and controlling how Web Pages appear. A generalized mark-up language can deal with many different document types, and a standard generalized mark-up language deals with all these documents in a standardized way.
And as you know, HTML presents data in a browser window in a multitude of shapes, sizes and colors, and provides extra features, such as forms and hyperlinks.
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