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1. Motherboard ● is sometimes shortened to  mobo ● is the main printed circuit board (PCB) in a computer ● is a computer’s central communications backbone connectivity point, through which all components and external peripherals connect.

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2. Processor/central  processing unit (CPU) ●	is a portion of a computer that retrieves and execute instructions ●	is essentially the brain of a computer aided design (CAD) system ●	is often simply referred to as the processor

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3. Power supply unit ●	is an internal IT hardware component ●   Despite the name, power supply units do not supply systems with power, instead they convert it ●	It’s supply power

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4. Hard Disk Drive ●	is the main, usually most substantial data storage hardware device in a computer. The operating system, software titles, and most other files are stores in the hard  dist  drive.

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5. Solid State Drive (SSD) ●	is a new generation of storage device used in computers. SSD’s are used flash-based memory, which is much faster than a traditional mechanical hard disk

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6. Random Access Memory                (RAM) ●	is the hardware in a computing devices where the operating system (OS), application programs and data in current use are kept so they can be quickly reached by the devices processors. RAM is the main memory in a computer. It is much faster to read from and write to than other kinds of storage , such as a hard disk drive (HDD), solid state drive (SSD) or optical drive.

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7. Computer Case ●	serves  eritical  functions much as skin does for the human body. System does protect the computer chassis, hard drive, motherboard, and other internal components for advanced blade serves, computer networks, or small desktop units.

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8. Graphics Card ●	is a type of display adapter or video card installed within computing devices to display graphical data with high clarify, color, definition and overall appearance.

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9. DVD – ROM ●	To permanent store data files ●	It is the abbreviation of digital versatile disc read-only memory

Parts of a system unit and its Functions

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