A: Inter-bank transaction means that banks buy or sell foreign exchange at an ideal exchange rate in order to meet customers' foreign exchange needs. Commercial banks are the core of the foreign exchange market, and almost every international transaction with a certain scale involves both borrowers and borrowers of commercial bank accounts in financial centers. Commercial banks usually enter the foreign exchange market to meet the needs of customers. Inter-bank foreign exchange transactions are the main part of foreign exchange market transactions. The exchange rate charged by banks to other banks is called interbank exchange rate.