HTML Markup
Historically, the desire to have text printed in specific formats meant that original manuscripts were "marked up" with annotation to indicate to the book-printer how the author would like sections of text laid out...
Introduction
HTML is the World Wide Web's core markup language. Originally, HTML was primarily designed as a language for semantically describing scientific documents. Its general design, however, has enabled it to be adapted, over the subsequent years, to describe a number of other types of documents and even applications. Today, HTML is used to organize the text and other forms of information, that we want to present on the web.
HTML is not a programming language; it is a markup language that defines the structure of your content. HTML consists of a series of elements, which you use to enclose, or wrap, different parts of the content to make it appear a certain way, or act a certain way. The enclosing tags can make a word or image hyperlink to somewhere else, can italicize words, can make the font bigger or smaller, and so on.