markup language

Markup languages are designed for the processing, definition and presentation of text. The language specifies code for formatting, both the layout and style, within a text file. The code used to specify the formatting are called tags. HTML,XHTML,XML,SGML are examples of widely known and used markup language.
      

Why "html" is called as markup language?
Markup language is a set of markup tags. HTML uses markup tags to describe web pages.Markup language is a text-formatting language designed to transform raw text into structured documents, by inserting procedural and descriptive markup into the raw text. Markup is what HTML do to the text inside them. They mark it as a certain type of text(like bold, italic, underline etc).
Markup language is a text-formatting language designed to transform raw text into structured documents, by inserting procedural and descriptive markup into the raw text.HTML is a language as it has its own code words like any other language.
Due to these reasons HTML is called Markup language.

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