Answer 1

To demonstrate that anything between <! - - and - - > is a comment in html.
Comments are written to provide additional information about the code and will not be executed

Answer 2

Yes

Answer 3

comments are just to keep track of what you have made...suplose you have written like 3000lines of codes after that i asked you find the dection for your roll a dice button..then you can find that easily if you have placed any comments there