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Memory: The memory of a computer is a storage area. It is temporary. It has the data and instructions that the CPU needs.

Modem: Modem stands for MOdulater-DEModulater. It enables a computer to transmit data.

Input Device: An Input device is a peripheral device. It is used to provide data and control signals to a computer. Eg. - Keyboard, Mouse etc.

Output Device: An output device is used to communicate the results of data processing. 

NIC: NIC stands for Network Interface Controller. It is a computer hardware component. It connects a computer to a computer network.