Sega is a Japanese video game company that develops and publishes games for various platforms, including consoles, mobile devices, and arcades. The company was founded in 1940 as a manufacturer of amusement machines and later expanded into the video game industry in the 1980s. Sega is known for creating popular franchises such as Sonic the Hedgehog, Yakuza, and Phantasy Star. The company is headquartered in Tokyo, Japan.