about <!-- -->tag

Question

what is meant by <!-- -->...please describe in details.

Answer 1

<!-- COMMENT --> is a comment tag
The comment tag is used to insert comments in the source code. Comments are not displayed in the browsers.

You can use comments to explain your code, which can help you when you edit the source code at a later date. This is especially useful if you have a lot of code.

Answer 2

It is to make a comment in the html code. These won't be displayed but are there to help you separate the code for easy findings. As an example:

<!--Your comment-->