Pof stands for Plenty of Fish. First and foremost is that it is free. The set up is a lot like match.com. Most metro areas have some sort of voluntary "facilitators" that put together periodic "meet ups" at local bars, etc. People sign up that they are going to attend so it gives you the opportunity to check out some of the people whose profiles you've viewed. Also good time for first meetings. I would recommend it for people willing to try online dating for the first time.