Windows 8 represents a major departure from previous versions of Windows because it is based on the Metro design language, which facilitates a touchscreen UI (user interface) similar to the ones found in mobile phones and tablet computers. Microsoft's Surface tablet, released in early 2013, runs Windows 8.
The basic version of Windows 8, suitable for most users, works with touch screen devices as well as with traditional keyboard-and-mouse systems. A version called Windows RT supports the ARM processor architecture. Another version, Windows 8 Pro, is aimed at business and technical professionals who desire encryption, virtualization, PC management and domain connectivity.