A creditor holding a secured claim, or a perfected lien, on a debtor's property. In bankruptcy, a secured creditor has the right to be paid before any other creditors out of the proceeds of its collateral. Secured creditors have other rights in bankruptcy, including the right to receive postpetition interest, fees, costs, and charges and to receive adequate protection for any decrease in the value of their interest in the collateral resulting from any use, sale, lease, or grant of a lien. They also can credit bid their claims in a section 363 sale of their collateral.