Secured loans or credit have an asset of some kind backing it. A car loan, for example, is a secured loan because of the value of the car. With a secured loan, the asset can be sold to pay back at least part of the loan.
A security interest is the interest a lender has in the property that is being used for collateral for a business loan. This type of loan is a secured loan, because it has collateral which can be used to pay off the loan in the case of a default.

