SGML vs. HTML — What's the Difference?

A standardized markup language for describing the logical structure of a computer document.

A markup language used to structure text and multimedia documents and to set up hypertext links between documents, used extensively on the World Wide Web.

(computer science) a standardized language for the descriptive markup of documents; a set of rules for using whatever markup vocabulary is adopted

A set of tags and rules (conforming to SGML) for using them in developing hypertext documents