Quake II is a 1997 first-person shooter video game developed by id Software and published by Activision. It is the second installment of the Quake series, following Quake. The game's storyline is continued in its expansions, including one tying in Quake II and the first game, and Quake 4.

id Software LLC is an American video game developer based in Richardson, Texas. It was founded on February 1, 1991, by four members of the computer company Softdisk: programmers John Carmack and John Romero, game designer Tom Hall, and artist Adrian Carmack.