A computer case contains the framework to support the internal components of a computer while providing an enclosure for added protection. Computer cases are typically made of plastic, steel, and aluminum and are available in a variety of styles.

The size and layout of a case is called a form factor. There are many types of cases, but the basic form factors for computer cases include desktop and tower. Desktop cases may be slimline or full-sized, and tower cases may be mini or full-sized, as shown in Figure 1.

Computer cases are referred to in a number of ways:

• Computer chassis
• Cabinet
• Tower
• Box
• Housing

In addition to providing protection and support, cases also provide an environment designed to keep the internal components cool. Case fans are used to move air through the computer case. As the air passes warm components, it absorbs heat and then exits the case. This process keeps the components of the computer from overheating.

There are many factors that must be considered when choosing a case:

• The size of the motherboard
• The number of external or internal drive locations called bays
• Available space

See Figure 2 for a list of features.

In addition to providing protection from the environment, cases help to prevent damage from static electricity. Internal components of the computer are grounded by attachment to the case.

NOTE: You should select a case that matches the physical dimensions of the power supply and motherboard.