Secured loans are a type of loan where the lender uses some form of collateral to secure their loan. The most common forms of collateral for secured loans are property or vehicles, but it can also be any other asset that has value.
If you default on your secured loan then the lender will seize this as collateral and use it to repay the outstanding amount of your debt. This is why secured loans are generally considered safer than unsecured loans, because if you default on payment they have something tangible that they could sell in order to recover their money.