The Xbox 360 (commonly abbreviated 360) is the second video game console to be produced by Microsoft, and was developed in cooperation with IBM, ATI, and SiS. Its Xbox Live service allows players to compete online and download content such as arcade games, game demos, trailers, TV shows, and movies. The Xbox 360 is the successor to the Xbox, and competes with the Sony PlayStation 3 and the Nintendo Wii as part of the seventh generation of video game consoles.
The Xbox 360 was officially unveiled on MTV on May 12, 2005, with detailed launch and game information divulged later that month at the Electronic Entertainment Expo (E3). The console sold out completely at release (with the exception of Japan) and, as of February 22, 2008, 18 million units have been sold worldwide. The Xbox 360 comes in three different versions, the "Arcade" console, the "Premium" console, and the "Elite" console, each having its own selection of included and available accessories. Another version of the Xbox 360, called the "Core" which was available from launch, has since been discontinued for retail and replaced with the "Arcade".