A sort code is a unique six-digit number used within the United Kingdom to identify the specific bank and branch where a bank account is held. This code is essential for facilitating domestic financial transactions, such as direct debits, wire transfers, and electronic payments. The sort code is typically presented in the format of three pairs of digits, for example, 12-34-56. The first two digits usually indicate the bank, while the remaining four digits identify the specific branch. Sort codes ensure that funds are accurately routed to the correct bank branch, enabling efficient and secure processing of payments within the UK banking system. They are a fundamental part of the UK's banking infrastructure, supporting various forms of financial activities from personal banking to business transactions.