Call of Duty is a first-person shooter video game franchise. The series began on Microsoft Windows, and later expanded to consoles and handhelds. Several spin-off games have been released. The earlier games in the series are set primarily in World War II, but later games like Call of Duty 4: Modern Warfare are set in modern times or in futuristic settings. The most recent game, Call of Duty: WWII, was released on November 3, 2017. An upcoming title, Call of Duty: Black Ops 4, is in development and to be released October 2018.