What HTML is?

(1) HTML: What it is?
 HTML is a document-layout and hyperlink specification language (or say markup language). It defines the syntax and placement of special, embedded directions that aren't displayed by the browser, but tell it how to display the contents of the documents, including text, images, and other support media. The language comes up with one very peculiar features of document interactivity through special hypertext links, in short called --hyperlinks--, which connect one document with other documents in the collections of documents, as well as with other Internet resources, like FTP and Email.
>>HTML gives authors the means to:<<
 - Publish online documents with headings, text, tables, lists, photos, etc.
 - Retrieve online information via hypertext links, at the click of a button.
 - Design forms for conducting transactions with remote services, for use in searching for information, making reservations, ordering products, etc.
 - Include spread-sheets, video clips, sound clips, and other applications directly in their documents.

(2) HTML standards and extensions, standards organizations:
 Currenly HTML 4.0 and above is already in implementations. Browser developers rely upon the HTML standard to program the software that formats and displays common HTML documents. With development of newer versions of HTML some changes in the tags occurs. Sometime older tags are deprecated or say replaced by newer tags. Often new tags are introduced. But meantime we need to use proper version browsers to run HTML we are using. Support of tag differs from browsers to browsers with respect to brands and their versions.
 Like many popular technologies, it became obvious that more formal means were needed to define and manage --to standardize-- HTML's features, making it easier for everyone to created and share documents.
 Focus, concern, reponsibility, how they work may differ to some degree from standards organizations. Major players in ther World Wide Wide standards are-
 (i) The World Wide Web Consortium (W3C) and
 (ii) The Internet Engineering Task Force (IETF)