an Internet browser such as Mozilla Firefox.
and more indulgent in some areas, such as syntax.
A pair of forward slashes // mark the beginning of a single line of comment.
The code placed before the slashes will be executed by the browser; only the code after the slashes will be considered a comment.
To add comments that span on multiple lines you have to use a forward slash followed by an asterisk at the beginning of the
comment and an asterisk followed by a forward slash at the end of the comment.
/* Comments are not displaied by the browsers
Comments are used for describing what code does
This is a multiple-line comment
Below I placed the slashes in front of the code
so the code will not be executed by the browser */