It helps to know some basics about the origins of HTML in order to understand HTML5. HTML began in the early 1990s as a short document that detailed a handful of elements used to build Web pages. Many of those elements were for describing Web page content such as headings, paragraphs, and lists. HTML's version number has increased as the language has evolved with the introduction of other elements and adjustments to its rules. The most current version is HTML5. Even if you have never seen any HTML (Hypertext Markup Language) code, you may be familiar with the fact that it is used to create most web pages. There have been several versions of HTML since the Web began, and the development of the language is overseen by an organization called the W3C (World Wide Web Consortium).The last major version of HTML was HTML 4.01 in December 1999. In January 2000, some stricter rules were added to HTML 4.01, creating what is known as XHTML (Extensible Hypertext Markup Language)
HTML5 is a natural evolution of earlier versions of HTML and strives to reflect the needs of both current and future Web sites. It inherits the vast majority of features from its predecessors, meaning that if you coded HTML before HTML5 came on the scene, you already know a lot of HTML5. This also means that much of HTML5 works in both old and new browsers; being backward compatible is a key design principle of HTML5 (see www.w3.org/TR/html-design-principles/). HTML5 also adds a bevy of new features. Many are straightforward, such as additional elements (article, section, figure, and many more) that are used to describe content. Others are quite complex and aid in creating powerful Web applications. You'll need to have a firm grasp of creating Web pages before you can graduate to the more complicated features that HTML5 provides. HTML5 also introduces native audio and video playback to your Web pages
We are using html5 in all our websites. HTML5 allows very advance features such as attractive animation, audio, Video Graphics, Advanced Website Design. etc