What are Groups?
Groups are a means to provide "connections" between roleplayers, whether by guild (Shrouded Dawn, Eternal Path), cross-guild organizations (Circle of Solaris, Accord), in-game groups (Argent Dawn, The Kirin Tor, The Clergy of the Holy Light).
You can join a group by going to the Group Directory, selecting the group you are interested in and then clicking "subscribe" in the right hand column (if the group moderator has elected to allow for subscriptions to the group). Alternatively, you can join a group by checking its checkbox in your "my account" settings.
Once you have joined a group, you will see it listed under "My groups" in the left hand column. You will be able to see who has posted to the group, as well as who is currently subscribed, etc. Basically, groups are a means to manage what sort of content you read (you'll see only content tagged by members of your group on the Group page) and establish connections with other characters that you might not have known about otherwise.

