How does a desktop work

A desktop is a person computer that you can take places ... well I really don't need to explain the rest since the other person already did.

A desktop computer is a personal computer designed for regular use at a single location on or near a desk or table due to its size and power requirements. The most common configuration has a case that houses the power supply, motherboard (a printed circuit board with a microprocessor as the central processing unit (CPU), memory, bus, and other electronic components), disk storage (usually one or more hard disk drives, optical disc drives, and in early models a floppy disk drive); a keyboard and mouse for input; and a computer monitor, and, often, a printer for output. The case may be oriented horizontally and placed atop a desk or vertically and placed underneath or beside a desk.