The Activity module shows the most recent posts and pages that were published and also recent comments made by visitors to your website. If you position the mouse over a comment, a menu appears underneath it with the following options:
There is also a All link to the Comments screen in the admin system where you can view all the comments that have been made.
We'll cover Comments in more detail later on.
Comments may not necessarily be enabled on your website. If they are not enabled then just ignore the Recent Comments module.