A Forum is essentially a bulletin board or discussion board. You may have multiple Forums on your Moodle course site, and within each Forum you may have multiple discussion topics. Replies to the original discussion topic, which is the first post to the discussion, or to subsequent reply will appear “threaded” (indented to show which reply belongs to which post). You may have noticed that one Forum is set up for your course automatically: it is called “Announcements,” and you can use it to communicate with the entire class. While a participant can always access a Forum on the course web site, you may also decide to have posts emailed to the participants.
To add a Forum, pull down the “Add an activity” menu and select “Forum.” You’ll be taken to the following screen.