Computer Hardware

Case

Definition

A computer case, also known as a computer chassis, tower, system unit, or cabinet, is the enclosure that contains most of the components of a personal computer (usually excluding the display, keyboard, and mouse).

Why It Matters

The case protects the delicate internal components from dust, physical damage, and static electricity. It also plays a crucial role in cooling by directing airflow over hot components.

Contextual Example

PC builders choose a case based on its size (to fit their motherboard's form factor), cooling performance (airflow design, fan mounts), and aesthetics.

Common Misunderstandings

  • The case is often mistakenly called "the CPU" or "the hard drive" by non-technical users.
  • Cases come in various sizes, such as full-tower, mid-tower, and small form factor (SFF).

Related Terms

Last Updated: December 17, 2025