Computer hardware

Motherboard

Motherboard - It is the "body" or mainframe of the computer, through which all other components interface.
Central processing unit (CPU) - Performs most of the calculations which enable a computer to function, sometimes referred to as the "backbone or brain" of the computer.
Computer fan - Used to lower the temperature of the computer; a fan is almost always attached to the CPU,
Firmware is loaded from the Read only memory eg. ROM run from the Basic Input-Output System (BIOS) or in newer systems Extensible Firmware Interface (EFI) compliant
Internal Buses - Connections to various internal components.
PCI (being phased out for graphic cards but still used for other uses)
PCI-E
ISA (obsolete in PCs, but still used in industrial computers)
USB
HyperTransport
CSI (expected in 2008)
AGP (being phased out)
VLB (outdated)
External Bus Controllers - used to connect to external peripherals, such as printers and input devices. These ports may also be based upon expansion cards, attached to the internal buses.