The foreign exchange retail market, also known as the customer market, refers to the foreign exchange trading behaviors and places between banks and individuals and corporate customers. Banks play an intermediary role in foreign exchange transactions with customers. On the one hand, they buy foreign exchange from customers, on the other hand, they sell foreign exchange to customers to earn the difference between foreign exchange buying and selling. It is also a foreign exchange service business provided by banks to customers, and it is the basis for the existence of the foreign exchange market.