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.

Foreign exchange includes foreign currency, that is, foreign currency.

Purchase of foreign exchange is a business in which citizens exchange foreign exchange (foreign currency) with their ID cards in China Bank. At present, only China Bank handles foreign exchange purchase. Simply put, it is to buy foreign exchange.