Foreign exchange mainly refers to foreign currency, including the means of payment for international settlement expressed in foreign currency. The exchange rate of clearing derivatives is called exchange rate. The International Monetary Fund defines foreign exchange as the creditor's rights that can be used by foreign exchange management authorities to maintain the balance of payments deficit in the form of money bank deposits, treasury inventory rights, short-term and long-term government securities, etc. Including: foreign currency, foreign currency deposits, foreign currency securities payment vouchers, etc.