Question

what is a computer ? How is it useful device ?​

Answer 1

computer is an electronic device.an electronic device for storing and processing data, typically in binary form, according to instructions given to it in a variable program.

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Answer 2

A computer is a programmable machine. The two principal characteristics of a computer are: It responds to a specific set of instructions  in a well-defined manner and it can  execute a prerecorded list of instructions.

It is useful device for students for making projects and getting information of something. It is helpful for bank for getting data about anyone.