When you invest in a bond and hold it to maturity, you will get interest payments, usually twice a year, and receive the face value of the bond at maturity. (investinginbonds.com)
At any given time, a bond ETF can trade at a discount or premium to its net asset value — the current value of the bonds in the portfolio. (thecollegeinvestor.com)
This is the most important feature of this sheet - calculating the resulting market value of a bond portfolio assuming interest rates change. (toolsformoney.com)