A bond in which payment of income on the principal is related to a specific price index, often the Consumer Price Index. This feature provides protection to investors by shielding them from changes in the underlying index. The bond's cash flows are adjusted to ensure that the holder of the bond receives a known real rate of return. In Canada, they also referred to as "real return bonds". 

|||This type of bond is valuable to investors because the real value of the bond is known from purchase and the risk involved with uncertainty is eliminated. These bonds are also less volatile than nominal bonds and they help investors to maintain their purchasing power. For example, assume that you purchase a regular bond with a nominal return of 4%. If inflation is 3%, you will actually only receive 1% in real terns. On the other hand, if you buy an index-linked bond your cash flow will be adjusted to changes in inflation and you will still receive the full 4% in returns.