Adding comments to your Drupal site adds interactivity between web visitors and administrators. The comments module allows discussions to grow on blog stories, information pages, articles, etc. which also creates further interest in a website.
Administrators of the Drupal site have the ability to approve or delete comments, or to even allow users to post comments without needing approval.
The display of comments can happen as either a threaded or flat list. A threaded list display the comments to show responses to specific comments in one section. A flat list will show all comments without grouping in the order specified by the administrators (new or old posts first).
Further configuration of the list can include an expanded or collapsed list. An expanded list will show the comment title and comment itself, while a collapsed list will display only the comment title.
A user may have the option of modifying their comment after posting it given the administrators have enabled the permissions to do so and no other comments have already been posted.
To assist in the process of creating proper discussions from comments, it helps to get notifications of any new comments that are left behind. For starters, logged in users are able to see which nodes have comments they have not yet read. These nodes are marked with a notice.
Users can also have an email sent when a new comment is left by using the Notify module.