why does computer need monitor in 30-40 words

ITS LIKE HAVING A BIKE BUT NO PETROL.MOUSE IS A MAIN DEVICE TO COMPUTER.IF THAT IS NOT THERE THEN CURSOR WHICH MOVES WITH THE HELP OF MOUSE WONT BE SEEN AND NOTHING CAN BE DONE IN THE COMPUTER UNTIL AND UNLESS THERES A MOUSE
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IT IS LIKE THAT WE HAVE COPY BUT DON'T HAVE PEN WE KNOW ALL THE PARTS OF THE COMPUTER IS VERY IMPORTANT BUT WITHOUT MONITER WE CAN'T SEE WHAT IS HAPPENING IN OUR COMPUTER . 
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computer is an mechanical device which when given a raw data(input) processes it and the gives the information(output)and because monitor is an output device, if the output devices are not there in the computer it will not be able to give the information for the raw data given by us.
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As u know computer is a mechnical device used for doing many thing ,simultaenosily its main thing is ALU(automatic logical unit),if there is no moniter in computer then u cannot do anything....with cpu,mouse,home theater,or ups there is no use of anything without monitor.it is like human without oxygen.if it helps u then please like it bro.
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Describe the various processes that lead to ultimate death of a tree?
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