Co-op mode, short for cooperative mode, is a game mode in which players can work together to play a game collaboratively. In co-op mode, players join forces and typically face the game's challenges as a team, rather than competing against each other. Co-op mode can be found in various types of games, including video games, board games, and even mobile games. It allows multiple players to play together either locally, on the same device or screen, or online, where players connect and collaborate over the internet.