A game server (also sometimes referred to as a host) is a server which is the authoritative source of events in a multiplayer video game. The server transmits enough data about its internal state to allow its connected clients to maintain their own accurate version of the game world for display to players. They also receive and process each player's input.
Private servers often host massively multiplayer online role-playing game genre games such as World of Warcraft, RuneScape, and MapleStory. These servers can attempt to provide a "stock"/standard experience, or can modify gameplay to change the difficulty, pace of character progress, available content, or available controls over the gameplay environment.
Rightsholding companies often attempt to and succeed in shutting down private server versions of their games. Between this and potential for operators to lose interest, private servers can be short-lived. However, there are also cases of games no longer being operated by the rightsholders, in which case a private server may have greater longevity than the sanctioned, defunct service.
Due to how private servers for games are often reverse-engineered and operated using incomplete information about the complete inner workings of the original game, it is common for standard featuresets to be incomplete or for the server to be less stable than an original. On the other hand, it is common for homebrewed features to be added by operators.
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