What is the main difference between HTML and html5?

Related questions

1. Why xhtml is used?
2. What are the features of css3?
3. What are the new features in css3?
4. What is the difference between HTML xhtml and html5?
5. What is difference between html4 and html5?
6. What is xhtml explain?
7. Why do we use html5?
8. What can be done with html5?
9. Why should I learn html5?
10. What is the new features of html5?

Tags

1. #inline
2. #video
3. #allow
4. #javascript
5. #support
6. #html5
7. #background
8. #whereas
9. #audio
10. #these
11. #possible
12. #provides
13. #within
14. #browser
15. #supports
16. #mathml