Basically, this is a place where you can try to find other people to roleplay with. Start up a topic with possible RP plots, or maybe what your pet is looking for in a mate and see who shows up! Or browse through what's already been posted to see if you're interested.
All in all, this should be a big help in finding plottage. No more backreading lots of pages just to see if anyone responded to your plot-requesting post!