An IBAN (or International Bank Account Number) is a unique code used for cross-border identification of bank accounts within the SEPA zone (Single Euro Payment Area) which includes the 27 Member States of the European Union plus Andorra, Vatican City, Iceland, Liechtenstein, Monaco, Norway, the United Kingdom, San Marino and Switzerland.
An IBAN contains information such as the country code, bank code, branch code and account number. It was created to streamline banking transactions and make them more secure, both domestically and internationally. Originally, each country had its own system for identifying bank accounts. The ISO 13616 standard, which allows for IBANs of varying lengths up to a maximum of 34 digits, including alphanumeric characters, was created to standardise the different systems.