explain money as a medium of exchange

----Money is considered as a medium of exchange,because,it is authorised by the Government Of India. It is printed by RBI(Reserve Bank Of India). ----If a person has money,he or she does not needs to satisfy double coincidence of wants. ----For example, if a person wants to have "wheat" and he has "shoes"....Then he can first exchange shoes for money and the money for wheat. ----So,Money helps to maintain a uniform currency in every place.