In gaming, co-op is short for cooperative and refers to a multiplayer game where players work together as teammates to achieve a common objective against one or more non-player character opponents (PvE) . Co-op games can be played locally using one or multiple input controllers or over a network via local area networks, wide area networks, or the Internet. Co-op gameplay has gained popularity as controller and networking technology has developed. Cooperative games designed to be played by multiple players on the same display screen have come to be known as "couch co-op", "local co-op" or "single-player co-op" games, while cooperative games in which players each use their own display system are known as "online co-op", "network co-op" or "multiplayer co-op" games. Co-op games can have up to 30 members, and fellow members can exchange crops and goods with each other, letting them develop their towns faster.