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These are typically metal or plastic enclosures designed to house and protect computer components such as the motherboard, hard drives, power supply, and peripheral devices. They come in various sizes, known as form factors, to accommodate different types of motherboards and other hardware. Common features include ventilation slots for airflow, drive bays for additional storage devices, and expansion slots for adding additional components. Some cases are designed for specific use cases, such as high-performance gaming or quiet operation for home theater PCs. They can also have a variety of external ports like USB, audio jacks and sometimes even ethernet port.