The term 'server' can refer to a different version of the game, such as the Asia servers or the North America servers, or the internal servers in one version of the game. In MMORPGs such as Ragnarok Online and Ragnarok Online II, players have the option to choose from multiple servers to play the game. A single server is designed to be accessed by multiple processes or devices. A server is a device that provides functionality for other programs or devices, called 'clients.' This architecture is called the client–server model.
