What are the 3 basic elements of a computer?

The basic element are:

• Monitor
• Peripherals
  • Keyboard
  • Mouse
  • Speakers
• The Tower
  • The Motherboard
  • The CPU (Central Processing Unit)
  • RAM (Memory)
  • Hard Drive (Main Storage Device)
  • CD or DVD Drive
  • Other (Card Reader, Optional Sound Card, etc)