Final answer:
A mortgage-backed bond is backed by a lien on specified real estate, providing security for the bondholders with the property as collateral, unlike other types of bonds such as corporate, municipal, or Treasury bonds.
Step-by-step explanation:
The type of bond that is backed by a lien on specified real estate owned by the issuer is known as a mortgage-backed bond. Unlike corporate bonds, municipal bonds, or Treasury bonds which are issued by firms, cities, or the federal government respectively, a mortgage-backed bond is secured by the mortgages on real estate properties. With these bonds, if the borrower defaults, the bondholders have a claim to the underlying property as collateral for their investment.