Computer Systems
1. Mother Board- A motherboard is the central or primary circuit board making up a complex electronic system, such as a modern computer.

2. CPU- is A central processing unit (CPU), or sometimes simply processor, is the component in a digital computer that interprets computer program instructions and processes data.

3.Power Supply- A computer power supply unit (Computer PSU), or Modular Power Supply Unit (MPS) is the component that supplies power to a computer.

4.Video Display Controller- that produces the output for the computer display. This will either be built into the motherboard or attached in its own separate slot (PCI, PCI-E or AGP), requiring a Graphics Card.