What is online game?

你殺死敵人後，敵人掉下什麼寶物和幾多金錢是由server決定，不是你面對前的電腦。

Online games are games played over some form of computer network. At the present, this almost always means the Internet or equivalent technology; but games have always used whatever technology was current: modems before the internet, and hard wired terminals before modems. The expansion of online gaming has reflected the overall expansion of computer networks from small local networks to the Internet and the growth of Internet access itself. Online games can range from simple text based games to games incorporating complex graphics and virtual worlds populated by many players simultaneously. Many online games have associated online communities, making online games a form of social activity beyond single player games.

自己看
http://zh.wikipedia.org/w/index.php?title=%E7%BD%91%E7%BB%9C%E6%B8%B8%E6%88%8F&variant=zh-hk

online game is a game who are you play with your friends or another players in the world.^.^