The Sega Master System (SMS) is a third-generation 8-bit home video game console manufactured by Sega. It was originally a remodelled export version of the Sega Mark III, the third iteration of the SG-1000 series of consoles, which was released in Japan in 1985 and featured enhanced graphical capabilities over its predecessors. The Master System launched in North America in 1986, followed by Europe in 1987, and Brazil in 1989. A Japanese version of the Master System was also launched in 1987, which has additional features over the Mark III and other regional variants of the console, namely a built-in FM audio chip, a rapid-fire switch and a dedicated port for the 3D glasses.
The Master System was released in competition with the Nintendo Entertainment System (NES). It had fewer well-reviewed games than the NES, and a smaller library, due to Nintendo licensing policies requiring platform exclusivity. Despite the Master System's newer hardware, it failed to overturn Nintendo's significant market share advantage in Japan and North America. However, it attained significantly more success in Europe and Brazil.
The Master System is estimated to have sold at 13 million units, excluding recent Brazil sales. Retrospective criticism has recognized its role in the development of the Sega Genesis, and a number of well-received games, particularly in PAL regions, but is critical of its limited library in the NTSC regions, which were mainly dominated by Nintendo's NES. As of 2015, the Master System was still in production in Brazil by Tectoy, making it the world's longest-lived console.