Diablo II is an action role-playing hack-and-slash computer video game developed by Blizzard North and published by Blizzard Entertainment in 2000 for Microsoft Windows, Classic Mac OS, and macOS. The game, with its dark fantasy and horror themes, was conceptualised and designed by David Brevik and Erich Schaefer, who, with Max Schaefer, acted as project leads on the game. The producers were Matthew Householder and Bill Roper.
Building on the success of its predecessor, Diablo (1997), Diablo II was one of the most popular games of 2000 and has been cited as one of the greatest video games ever made. Major factors that contributed to the game's success include its continuation of popular fantasy themes from the previous game and its access to Blizzard's free online play service, Battle.net. An expansion to the game, Diablo II: Lord of Destruction, was released in 2001.