lien is a guarantee or protection of payment process this means that it is a contract or record between the lender and the buyer it puts on property of the lender like building or personal property like car but the buyer can not sell it until finishing the payment process and allow the lender to restore the property in case of the buyer didn't finish his payment. we have different types of liens 1- consensual lien is agreement between the lender and buyer, it guarantees that the bueyr can not ell or act in the property unless he pays it off. 2- statutory lien or non consensual lien means the lender can get his payment through an order from court by putting a claim on asset in case of unpaid bills, and this type of lien has some types: *tax lien; the government can use it by holding a property of someone as a guarantee when he stop to pay the taxes. * Mechanic's lien when the contractor fix something in the homeowner and the homeowner did not paid to him so the contractor can go to court to get judgement against those who did not paid to get his money