What is a Lien

A Lien is a legal right your creditor has in your property.  It ensures you will pay your debt.  A lien can be enforced (you lose the property) if you do not pay the debt.

The bank you pay your car loan to has a lien on your car.  The bank will repossess your car if you do not pay the loan.

A home mortgage is a lien.  It gives the bank the right to take your house through foreclosure.