The main parts of the computer are a display unit or monitor, system unit, input devices (keyboard and mouse) and peripheral devices (such as speakers, printer, etc.).
The system unit is the costliest component of the entire computer system. This unit consists of the central processing unit (CPU), hard drive, RAM, etc. The system unit also houses USB slots, CD drive, etc. One can think of the CPU as the brain of the computer. This is where the main operation or computing really takes place. CPU carries out all the processing and controls all the other devices.
The display unit is the screen on which we see the information. It is also known as the monitor.
The keyboard and mouse are used to interact with the system by feeding in the information. A printer is used for printing out desired information. A speaker is used for playing the sound.
Hope this helps.
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