Comments are essential part of every programming language. Comment tags are also available in HTML and CSS. The comment tags will not be displayed on a webpage. Comment tags are used to insert user comments in a source code. You can write comments in HTML for explaining the code, defining one or more particular areas of coding and separating them in case of large programming files. This will help you a lot when you are editing or simply reviewing the source code later. Here we will show you how to insert comment in HTML and how it works.