Main Components of a Computer.

By Operating System
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A modern computer have four main components :

  1. Memory : Primary( is a semiconductor memory, volatile e.g. RAM) and Secondary (non-volatile auxiliary memory e.g. Hard-disk) memories.
  2. Input unit : e.g. Keyboard, mouse.
  3. Central Processing Unit (CPU).
  4. Output Unit. e.g. Monitor, Printer.