More detail of comment

Question

<!-- This is a comment-->

Answer 1

Comments are "non executable" parts of a code.

A programmer writes a code according to his own algorithm which might not be understood by another programmer reading the code.
Well written comments which provide information as to what a part of the code is doing will help the reader understand the code.!!!

Answer 2

Comments help the people programming see which parts are which parts of the game. Comments are wrote like this:
// This is a comment

Answer 3

//This is a comment