Xbox was first released on November 15, 2001 in North America, February 22, 2002 in Japan, and on March 14, 2002 in Europe.
The Xbox 360 was the first home console to be released in the seventh generation of game consoles and competes against Sony's PlayStation 3 and Nintendo's Wii.
Its Xbox Live service allows players to compete online as well as download games and additional content.
With the launch of the Xbox 360, Microsoft's online gaming service, Xbox Live went through a major upgrade, adding a basic non-subscription service, Silver, to its already established premium subscription-based service, Gold.
Xbox Live Arcade is an online service operated by Microsoft that is used to distribute arcade video games to Xbox and Xbox 360 owners. In addition to classic arcade games, the service offers some new original games as well as games from other consoles.
The full list of backward-compatible games is maintained at Xbox.com.
Xenos contains 48 unified shader units, which are capable of both vertex and pixel shading operations. This is in contrast to older graphics processor designs which utilize separate specialized units for these tasks.