Foreign exchange in a broad sense refers to all assets owned by a country in foreign currency. According to the degree of restrictions on foreign exchange, it can be divided into freely convertible foreign exchange, limited freely convertible foreign exchange and bookkeeping foreign exchange. According to the right to use foreign exchange, it is divided into ① central foreign exchange ② local foreign exchange ③ special foreign exchange.
Foreign exchange transactions are divided into firm foreign exchange transactions and margin foreign exchange transactions.