Foreign exchange is a foreign currency or a means of payment expressed in foreign currency that can be used for international settlement. Article 3 of 1996 "Regulations on Foreign Exchange Management" promulgated by China stipulates the following specific contents of foreign exchange: foreign exchange refers to: ① foreign currency. Including paper money and coins. ② Foreign currency payment voucher. Including bills, bank payment vouchers, postal savings vouchers, etc. ③ Foreign currency securities. Including government bonds, corporate bonds, stocks, etc. (4) Special Drawing Rights and European Monetary Units. ⑤ Other assets denominated in foreign currency.