Computer case
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A computer case, also known as a computer chassis, is the enclosure that contains most of the hardware of a personal computer. The components housed inside the case are referred as the internal hardware, while hardware outside the case are known as peripherals.
An ATX case. The motherboard (microATX) is in a horizontal position at the top, and the peripheral connectors go at the panel located at the rear of the case and USB ports at the top. The fans are also at the rear and front. The power supply is on the bottom rear.
A full tower case. Accessories shown include: a fan controller, a DVD burner, and a USB memory card reader.
An empty computer case
Interior of a 2018 ATX computer tower
Computer hardware
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Computer hardware includes the physical parts of a computer, such as the central processing unit (CPU), random access memory (RAM), motherboard, computer data storage, graphics card, sound card, and computer case. It includes external devices such as a monitor, mouse, keyboard, and speakers.
PDP-11 CPU board
Inside a custom-built computer: power supply at the bottom has its own cooling fan
Computer motherboard
An IBM System z9 mainframe