Tom Clancy's Rainbow Six is a media franchise created by American author Tom Clancy about a fictional international counter-terrorist unit called "Rainbow". The franchise began with Clancy's novel Rainbow Six, which was adapted into a series of tactical first-person shooter video games.
The first game was developed by Red Storm Entertainment, while the novel was being written. The game later spawned a number of sequels and expansion packs. Red Storm was later acquired by Ubisoft, who currently develops and publishes the games. Mobile phone versions of the game are developed and published by Gameloft.
Rainbow Six and its sequels defined the tactical shooter genre, forcing players to focus more time and effort on stealth, teamwork, and tactics rather than on sheer firepower. With some of the more recent releases however, the games have taken on more of a "mainstream" first-person shooter approach in an attempt to appeal to a wider audience.
After Rainbow 6: Patriots was cancelled, the following game, Rainbow Six Siege, would reboot the franchise.