Comment is a piece of code which is ignored by any web browser. It is a good practice to add comments into your HTML code, to indicate sections of a document, and any other notes to anyone looking at the code. Comments help you and others understand your code and increases code readability.
HTML comments are placed in between <!– … –> tags. So, any content placed with-in <!– … –> tags will be treated as comment and will be completely ignored by the browser.