Bankbook – this term finds application in the Banking Law in some jurisdictions. It refers to a deposit sheet or a deposit document, attached to a bank account. This official document is usually issued by the bank which keeps the account open, towards the account holder, or to other officials who request to see actual information about the account. So the bankbook basically shows the precise breakdown of the deposited and/or withdrawn amounts in the account. In the practice, if signed and stamped, then it could be used as a valid proof in court, for example.