The provision of banking services by one bank to other banks that do not have the staff resources to perform the services themselves is called correspondent banking.
A "correspondent bank" is a financial institution that provides services to another, often in another country. In conducting business transactions, taking deposits, organizing wire transfers, and completing paperwork, it acts as a middleman or agent for another bank.
When dealing with transactions that begin or end in other countries, domestic banks will most usually use correspondent banks. Typically, local banks employ correspondent banks to gain access to foreign financial markets and serve international clients without having to establish foreign branches.
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