What is a HTML5

HTML5 is a revision that is being built by the W3C consortium for inclusion as the next big change in standard HTML. As a precursor previous: XTHML HTML 4.01 and 1.1,
HTML5 is a standard for structuring and
displaying content on the World Wide Web. This standard introduces new features like playing videos, and drag and drop, Previously these features rely on third-party plugins in browsers such as Adobe Flash and Microsoft Silverlight.