System unit

Updated: 11/13/2018 by Computer Hope

Alternatively referred to as a box, main unit, and system box, a system unit is the case that contains all the main parts of a computer. Below is a picture of a computer with each of the main components that help make up a computer. In the picture, you can see the system unit, flat-panel display, speakers, keyboard, and mouse. We've also labeled each of the input devices and output devices.

Desktop computer

Is there a difference between a computer, desktop, and system unit?

No. As long as you are referring to the case that holds all the main parts of the computer (e.g., CPU, motherboard, hard drive, and RAM) all these terms are synonymous.

What are the parts of a system unit?

As the computer has developed to what it is today, there have been many parts that make a system unit. See our computer definition for a complete list of all the computer components.

Chassis, Desktop, Enclosure, Hardware terms