A lien is a legal claim or right against a property that allows a lender or creditor to take possession of the property if the borrower fails to meet their obligations, such as repaying a loan. Liens can be placed on various types of property, including real estate, vehicles, and personal belongings, and they serve as a form of security for the debt. There are different types of liens, such as mortgage liens, which are used by banks when they lend money to buy a home, and mechanic's liens, which contractors can file if they are not paid for their work. Liens can affect the property owner's ability to sell or refinance the property until the debt is settled.