Mortgage loan. Mortgage means that the debtor or the third party does not transfer the possession of the collateral and takes the collateral as the guarantee of the creditor's rights. Pledge pledge refers to the debtor or a third party handing over his movable property to the creditor, or handing over his property right to the creditor, and taking the movable property or property right as the guarantee of the creditor's right. Lien. Lien means that in the custody contract, transportation contract and processing contract, the creditor occupies the debtor's movable property according to the contract, and the debtor fails to perform the debt within the time limit stipulated in the contract, and the creditor has the right to lien the property in accordance with the provisions of the security law, with priority paid for the discount of the property or the price of auction or sale of the property.