An account number is a unique set of numbers typically between 8 and 12 digits assigned to a customer’s account. Using the number, the customer can be identified and given access to transact using the respective account.
When you want to make a credit transfer or authorise a direct debit, you’ll need to provide the account number of the beneficiary to enable the transfer. When sending money through an online money transfer provider directly to the recipient's bank, you’ll be asked to provide their account number.
If you have a cheque book, your account number will be right at the bottom of the cheque leaf. Usually, there are 3 groups of numbers, the first set is the routing number, the second is the account number and the third is the cheque number.