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Developer(s)Valve Software
Publisher(s)Sierra Studios, Electronic Arts, Valve Software
Year introduced1998

Half-Life is a science fiction first-person shooter computer game series which consists of two full games and five expansions, as well as a number of demos featuring exclusive content. The series has been ongoing since 1998.

Most of the games and expansions in the series have been developed by Valve Software and published by Sierra Studios, although some of the expansions were produced by Gearbox Software. Electronic Arts also took over distribution of the games in the series from Sierra from 2005 onwards. The series was initially released for the PC, but console ports of most installments have also been released.

The protagonist of Half-Life is Gordon Freeman, an employee of the Black Mesa Research Facility, although some of the expansions feature other controllable characters.