A passbook or bankbook is a paper book used to record bank transactions on a deposit account. Depending on the country or the financial institution, it can be of the dimensions of a chequebook or a passport.The Post Office Savings Bankintroduced passbooks to rural 19th century BritainTraditionally, a passbook is used for accounts with a low transaction volume, such as a savings account. A bank teller orpostmaster would write, by hand, the date and amount of the transaction, the updated balance, and enter his or her initials. In the late 20th century, small dot matrix or inkjet printers were introduced capable of updating the passbook at the account holder's convenience, either at an automated teller machine or a passbook printer, either in a self-serve mode, by post, or in abranch.