Comment tags are used to insert comments in the HTML source code.
HTML Comment Tags
You can add comments to your HTML source by using the following syntax:
<!-- Write your comments here -->
Notice that there is an exclamation point (!) in the opening tag, but not in the closing tag.
Note: Comments are not displayed by the browser, but they can help document your HTML source code.
Example
<!-- This is a comment --> <p>This is a paragraph.</p> <!-- Remember to add more information here -->