A computer is an electronic device which takes our data, process on it and gives us meaningful result.
(i)  A computer is Technically help full device and it is an electronic device that makes man work has a precious role in every one's life it has good and adverse effect's if it is used in bad manner. 

(ii)  computer was invented by charles babbage.

the main parts of computer are cpu (central processing unit) .moniter,mouse key board etc., 

it process the info given by us and gives out help full result.

example of a computer is dell,hawlett packyard i.e., hp etc.,

the majorly used os in computer's now a day's is Micro Soft.
                                                                                              Thank you!
                                                                                          have a nice day..