The document defines and describes different types of gamers: casual gamers who play games casually, mid-core gamers who play a wider range of games enthusiastically but not as intensely as hardcore gamers, hardcore gamers who make gaming a central part of their lifestyle, pro-gamers who play competitively for money or as a career, and other types like newbies, retro gamers, gamer girls, and gaymers. It provides short descriptions of each type of gamer.