HTML5 is the fifth and current major version of the HTML standard, and subsumes XHTML. It currently exists in two standardized forms: HTML 5.2 Recommendation by the World Wide Web Consortium (W3C, a broad coalition of organizations), and living HTML (not an official standard) by the Web Hypertext Application Technology Working Group (WHATWG, a more narrowly focused coalition).
HTML5 is a response to the observation that the HTML and XHTML in the early 2000s were too complex and not suitable for the demands of Web applications. The W3C started work on HTML5 in 2007.
While some features of HTML5 are often compared to Adobe Flash, HTML5 is, in fact, three technologies:
HTML5, which provides a richer set of tags for describing content
CSS3, which improves the ability to style content
HTML5 is not yet an official standard, but all major browsers support most of its features.
What HTML5 means?
HTML5 is the latest version of the HTML standard, which is the markup language used to structure and present content on the World Wide Web. HTML5 was released in October 2014, and is the fifth major revision of the HTML standard since the inception of the World Wide Web in 1989.
HTML5 is a major update to the HTML standard that adds new elements, attributes, and APIs (Application Programming Interfaces) to the language. Some of the new features include: