A debt security issued by a corporation, government, or government agency obligating the issuer to pay interest at pre-determined intervals and repay the principal at maturity. Every bond has a set face value, also known as a par value, which names the amount of money the bondholder will receive when the bond reaches the date of maturity. The face value will never change, but the market value of a bond may fluctuate. If a bondholder sells a bond before its date of maturity, he or she may receive more or less than the face value.