Personal loans through Prosper are unsecured loans. They do not require collateral. Secured loans are loans that require collateral, such as a mortgage or an auto loan. When providing collateral for a secured loan, borrowers have a lien placed on the asset used as collateral for the loan, and that lien is removed once the loan is paid off. Personal loans through Prosper are unsecured. Personal loans through Prosper do not require collateral. To learn more about the difference between secured and unsecured loans, visit our blog post on the topic here https://www.prosper.com/blog/secured-vs-unsecured-loan-what-to-know-before-you-apply/.