Why do we need Money?

Do you really think as a human race today in this era of history, with all the advances in technology and new found natural resources. Do you think we really need money to survive? We as a world today live in a Monetary system – where money decides which class of people we are, it plays a part in everything we do on a day to day basis. Do you know that some countries spend so much money on war or military / the same amount of money could have been used to send every senior highschool student to college. I would like to know your opinion on how important you really think money is to your life and do you really think why we as the only beings on this planet who are so educated and smart need to have it?