The first difference in bitcoin and real money is of physical existence,  bitcoin is virtually concept while real money has  existence.  Bitcoins is continously growing up and it's price are skyrocketting but real money is only a mode of currency,  although bitcoin in itself become a investment as it's prices keep on increasing. Bitcoin is trending,  everyone wants to buy bitcoin.  Bitcoins has been tax free and easy transaction method but cash leads to transaction fees,  taxes by the government.