Parts of a Computer

A computer is made up of four essential parts: the system unit, monitor, keyboard, and mouse. It would be very hard, if not impossible, to operate the computer if one of these were missing. You could, of course, still use the computer without a mouse if you memorized all the keyboard shortcuts, but the graphical nature of most programs nowadays has made the mouse an indispensable part of the computer.
The system unit is the main part of the computer where all the action takes place. It houses all the components that make your computer run. Many people mistakenly refer to it as the CPU when in reality the CPU is just a small chip inside the system unit.