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A computer is an electronic device that can accept data, manipulate data, produce information and store it back into the memory.

A computer opearates under the control of instructions (software) stored in its own memory unit.

Modern computers are electronics and digital devices that computes, performs high-speed mathematical or logical operations or that assembles, stores, correlates or process information.

Generally, the term 'computer is used to describe a collection of devices that function together as a system. This devices are CPU (Central Processing Unit), monitor, keyboard, mouse etc.