CPU - It is the brain of the system. It controls the computer's actions, performs all calculations and generally dictates the speed at which these happen., Motherboard - This is a large circuit board into which all the computer components (including the CPU) are plugged into., Fan - This component is used for cooling purposes. It draws cool air into the case from the outside, expels warm air from inside, or moves air across a heatsink to cool a particular component., Modem - This component is used for cooling purposes. It draws cool air into the case from the outside, Main memory - This is the components that store the date and/or instructions that are about to be processed or have just been processed., Sound card - A piece of hardware inside the computer which allows you to listen to sound., Network interface card - A device which allows a standalone PC to connect to a network, Router - This is used to connect two networks together eg a home network to the in the Internet, Hub - This device allows computers to be connected together in a network., Graphics card - This device allows you to, Peripheral - This is any device that is outside the computer but is attached to it and is under the control of the CPU., USB connector - This is used to connect a computer with another device such as flash memory,

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