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Components of the Computer System
MAJOR HARDWARE COMPONENTS OF A COMPUTER SYSTEM
SYSTEM UNIT
It is also called the computer case, computer chassis, or computer tower. Cases are typically made of steel or aluminum, but plastic can also be used. While most computer cases are rather dull, black, metal boxes, some manufacturers try to give the unit some flair with color and special design elements.

MOTHER BOARD / SYSTEM BOARD
A motherboard is one of the most essential parts of a computer system. It holds together many of the crucial components of a computer, including the central processing unit (CPU), memory and connectors for input and output devices
CPU ( Central Processing Unit)
The central processing unit (CPU) is the unit which performs most
of the processing inside a computer. To control instructions and data flow to and from other parts of the computer, the CPU relies heavily on a chipset, which is a group of microchips located on the motherboard.
EXPANSION BUS
Computer bus that adds more expansion slots to its main bus (which comes pre-installed with the computer) to accommodate more peripheral devices such as memory cards or boards, game controllers, and backup drives.
ADAPTER
An adapter is a physical device that allows one hardware or electronic interface to be adapted (accommodated without loss of function) to another hardware or electronic interface. In a computer, an adapter is often built into a card that can be inserted into a slot on the computer's motherboard. The card adapts information that is exchanged between the computer's microprocessor and the devices that the card supports
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