HTML is a document layout and hyperlink specification language, HTML files mostly have an HTML or him extension hypertext is a special kind of text. It is not sequential like in a book, if you quickly want to look up something in a book you look at the index or table of contents, Hypertext is much more effective in that respect, you can connect word and pictures to other pages, pointing your mouse there will lead you to those pages, that may reside on a web server on the other side of the world, this (hyper) linking is the main power of the web .
Markup comes from the world of printing. It tells the typesetter how to put text and images on a page that will be printed. it contains directions on fonts, character size spacing, white areas on the page etc. HTML pretty much does the same, only replacing the typesetter with your browser. In short, Html is the language that tells the the browser how to display hypertext on a computer screen the contents of the document including text, images and other support media, the language also tells you how to make a document interactive through special hypertext links, which connect your document with other documents on other your computer or someone else’s as well as with other Internet resources, like FTP.
HTML Standards and Extensions
The basic syntax and semantics of HTML are defined in the HTML standard, currently, Version HTML5 given the pace of these standards matters one never knows when or if a new standard version will come to fruition Browser developers rely upon the HTML standard to program the software that formats and displays common HTML documents. Authors use the standard to make sure they are writing effective, correct  HTML documents. Nonetheless, commercial forces have pushed developers to add into their browsers Netscape Navigator and Internet Explorer, in particular, nonstandard extensions meant to improve the language many times these extensions are implementations of future standards still under debate Extensions can foretell future standards because so many people use them. In this book, we explore in detail the syntax-semantics and idioms of HTML version 5

Standards Organizations
Link many popular technologies, HTML started out as an informal specification used by only a few people, As more and more authors began to use the language, It became obvious that more formal means were needed to define and manage to standardize HTML’s features making it easier for everyone to create and share documents,
The International Organization for standardization

HTML  gets its root from SGML the standard Generalized markup language which the International Organization for Standardization released ISO 8879 a paper entitled  

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