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First Person Shooter (FPS) multiplayer games like Counter-Strike, Half-Life, Quake Arena and the freely distributed Enemy Territory is the most popular type of on-line games.

What do you need to play these games? First of all you need to have the game installed on your computer. For the great majority of games (e.g. Counter-Strike, Half Life, Quake Arena) you will simply need to buy them. On the other hand, Enemy Territory is free and you can easily download it from the web.

The other requirement is a game server, i.e. a server that will host the actual game. In simple words, the server is a very powerful computer with great/super fast internet connection which runs the game and where players connect to play.