What's the difference between html & html5?

Answer 1

In 1997 was evolved HTML4. Then W3C started developing extensible HTML (XML+HTML) next year. Due to next limitations in evolving XHTML (because of RSS, Atom...) in 2004 they started to think about HTML5. After ten years and lots of conclusions with WHATWG we had this new version. It provides awesome features and APIs like geolocation and so on. Now all the major browsers support it, some features just need special instructions to support with XP's IE6 for instance

Answer 2

That's the same... Html5 is Html, Html got different version and Html5 is the last update for the moment and that's support by all modern browser, even the bad Internet Explorer.