Co-op games are games played by friends on a gaming console or a PC. Depending on game-to-game or even game-mode-to-game-mode, players may indulge in PvP (Player vs. Player) or PvE (Player vs. Environment). PvP refers to those games or game modes wherein you are matched up against other real-world players. PvE refers to those games or game modes where you do not have to play against other real world players but with the in-game AI.