Sega is an American/Japanese videogame company created in 1954 by David Rosen.
The company Rosen Enterprise was funded in Japan and aimed at creating machines to entertain the American military bases in Japan.

In 1965, while Rosen wants to make his company bigger, he decides to rename it Sega (for services games). Following the 1983 videogame market crash, Hayao Nakayama takes the lead of the company.

Sega commercialized its first console this year, the SG-1000 Mark I and will keep producing other consoles. However, the failure of the Dreamcast in 2001 made Sega stop the production.

Still, the company is still present in the game creation with its association with Nintendo and the adaptation of the Olympic games with Sonic and Mario.