A  bond is a debt security, in which the authorized issuer owes the holders a debt and, depending on the terms of the bond, is obliged to pay interest (the coupon) and/or to repay the principal at a later date, termed maturity.

A bond is a formal contract to repay borrowed money with interest at fixed intervals.  The most traded types of securities are the fixed rate bonds, the coupon amount remains constant, the floating rate notes, the variable coupon is linked to a reference interest rate, such as LIBOR or Euribor and the Zero-coupon bonds, which pay no regular interest.  

The main elements that featured the bonds returns are the maturity, the rating, the liquidity and the coupon.