Doom - The Doom Wiki at

Doom (officially cased DOOM) is the first release of the Doom series, and one of the games that consolidated the first-person shooter genre. With a science fiction and horror style, it gives the players the role of marines who find themselves in the focal point of an invasion from Hell. The game introduced deathmatch and cooperative play in the explicit sense, and helped further the practice of allowing and encouraging fan-made modifications of commercial video games. It was first released on December 10, 1993, when a shareware copy was uploaded to an FTP server at the University of Wisconsin.

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Doom Wiki – Everything you need to know about the game