The system unit is a case that contains electronic components of the computer used to process the data. System units are available in a variety of shapes and sizes. The case of the system unit, also called the chassis, is made of metal or plastic and protects the internal electronic parts from the damage.
The motherboard, sometimes called a system board is the main circuit board of the system unit. Many electronic components attached to the motherboard, such as processor, memory, and expansion slots.
The soundcard and video card are examples of adapter cards, which allow a user to enhance the computer system with add-on products.
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the processor, also called a central processing unit or CPU, interprets and carries out the basic instructions that operate a computer. The processor is made up of the control unit and a arithmetic/logic unit performs the logical and arithmetic processes. High-end processors contain over 100 million transistors and are capable of performing some operations 10 million times in a 10th of a second, or in the time it takes to blink your eye.