Question

What is a computer how i is it useful device?

Answer 1

Computer is a electronic device which is capable of accepting , producing , and processing with highest speed with complete accuracy

In this generation you will see everywhere computer because it calculate thing faster than then human with complete accuracy
it is useful for many things

Answer 2

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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