Glossary » X-Windows
a standard graphics platform for GUI environments. The X-Windows environment is defined as a terminal standard, much like text terminals (e.g. VT100), but for graphics. X-Windows typically runs on Unix systems and allows both local and remote users of a Unix system to have a graphical user interface to the system. The X-Windows platform is fairly basic and doesn’t include specific user interface components, such as windows and menubars, for which a window manager or user interface toolkit (such as Motif) would be required.