What is the difference between doctype HTML and HTML?

Related questions

1. How can we create doctype in html5?
2. How do I know html5?
3. What is the difference between HTML and html5?
4. What does doctype mean?
5. How do you know which HTML version I am using?
6. Is doctype html important?
7. Does html5 need doctype?
8. What is doctype >? Is it necessary to use in html5?
9. What is doctype is it necessary to use in html5?
10. Is html5 compatible with older browsers?

Tags

1. #doctype
2. #which
3. #document
4. #browser
5. #using
6. #content
7. #tells
8. #version
9. #element
10. #holding