Regular Income: Bond issuers are bound by the terms of the bond to pay out regular coupon income to the bondholders (subject to the credit risk of the issuer).
Hedge against inflation: With the proper bond selection, you may potentially earn an investment return which keeps pace with or even exceeds the inflation rate.
Capital appreciation: Like all instruments traded in the secondary market, the price of a bond can appreciate (or depreciate) over and above (or below) the initial purchase price, and allow an investor to realize capital gains (or losses).