Securities that provide interest payments as compensation for the use of an investor's (i.e., lender's) funds. These payments usually last for a specific period. The principal (original loan amount) is usually paid at the end of this period. Some debt securities are backed by the credit of the issuer (i.e., Treasury bonds are backed by the credit of the U.S. government). However, other debt securities are backed by specific assets of the issuer. These securities are known as asset-backed bonds.