Computer cabinets are fitted with doors and side panels (which may or may not be removable). Cabinets enclose a rack, which is a frame that provides a means for mounting electronic equipment. Cabinets come in a variety of styles, colors, and many contain baffles, fans, and other features. [Adapted from The Sun Site Planning Guide for Entry-Level Servers].
The terms rack and cabinet are often used interchangeably, which is incorrect. The rack refers specifically to the frame that provides a means for mounting electronic equipment, while a cabinet is fitted with doors and side panels.
See also computer rack.