Lien is a legal term used in banking and finance to refer to a security interest granted over an item of property to secure the payment of a debt or performance of some other obligation. A LIEN is typically granted by a creditor to a debtor, and it gives the creditor the right to take possession of the property if the debt is not paid. Bank security is a term used to describe the measures taken by banks to protect their assets and customers' funds from theft, fraud, and other criminal activities. Bank security includes physical security measures such as locks, alarms, and surveillance systems, as well as digital security measures such as encryption and authentication protocols.