Foreign exchange refers to the means of payment and assets expressed in foreign currency that can be used for international settlement, including: foreign currency (banknotes and coins); Foreign currency payment vouchers (bills, bank deposit vouchers, postal savings vouchers); Foreign currency securities (government bonds, corporate bonds, stocks, etc.). ); Special drawing rights; Other foreign exchange assets

World currency means that money plays a role as a universal equivalent in the world market. There is only gold at present.