An account number is a unique identifier assigned to a specific account held by a customer at a financial institution, such as a bank or credit union. This number is used to track and manage the account, allowing the institution to process transactions, deposits, and withdrawals accurately. Each account number is distinct, ensuring that no two accounts are confused with one another. Account numbers are typically found on bank statements, checks, and online banking platforms. They can vary in length and format depending on the institution. It is important to keep your account number secure, as it can be used for unauthorized access to your bank account.