Cooperative games or Co-op games require two or more players to work together. Co-op games take on many guises. In shooters, players fight to support on another. At the other end of the spectrum, puzzle games let players put their heads together to over come obstacles.
Most cooperative games require access to the Internet to connect to other players. The cooperative concept has permeated all genres, extending the lifetime of the game. When picking up a Co-op game, you should consider how you and your friends would interact in the game world. Some games require headsets to communicate with one another. You should also consider other community features like game making and guilds. Can you make your own game or have your own dedicated server? Will a computer do all the match making and team balancing for you? These are all valid questions you should consider before buying a cooperative game.