HTML5 is the most recent and updated version of HTML. It is the next version of the HTML4. HTML5 is still not an official W3C standard. HTML5 has introduced new tags which include article, audio, video, canvas and lot many more. With the help of HTML5 you can now play any video or audio without downloading any additional plugins on your web page.
With HTML5, developers can create a website that operates like desktop application which allows you to use the web platform to reach all of your users at once.
HTML5 also introduced few interesting new semantic tags which allow to structure your content so that the structure has meaning, sometimes known as semantics. The semantic tags include <article> , <section>, <header> ,<footer>, <aside>, <nav> and <figure> tags. This allows you to place important elements into sections. It's also useful for search engines and aggregators.
HTML5 is the future that explains how webpages are going to be built. Apple and Google already support a great deal of HTML5 features. Different browsers support different features and therefore you will have to do some tricks to make some of the elements of HTML5 work correctly.
Almost all latest browsers like Safari, Google Chrome, Mozilla Firefox, Opera, Internet Explorer 9.0 support many HTML5 features and functionalities. The good thing is that now many mobiles web browsers like iPhones, iPads, and Android phones all have excellent support for HTML5.
HTML5 can be classified into several groups based on their functions.