What is comment? How to use it?

<PLEASE USE THIS TEMPLATE TO HELP YOU CREATE A GREAT POST!>

<Below this line, add a link to the EXACT exercise that you are stuck at.>

Comment
<Below this line, in what way does your code behave incorrectly? Include ALL error messages.>

I don’t know how to use comment



Replace this line with your code. 


Comments are used to annotate code, and explain what it does to readers of the code.

In CSS they are done like this;

/* this is a comment */

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