A coupon bond is a bond that pays a periodic interest payment to the bond owner. Most bonds in the US pay interest semiannually. At some point in the future almost all of these bonds must be paid off. This time is called the maturity of the bond. The firm only gets money for selling in the primary market.
Bonds are extremely sensitive to interest rates.
A central tenet to bond investing is that bond prices move in the opposite direction of interest rates. Therefore, rising interest rates are bad news for bond investors and falling rates are good news. Without getting too detailed this is because if interest rates in the market go up, there are other firms selling comparable bonds at the new, higher, interest rate. To get investors to buy the old bonds, their price must fall. The longer the life of the bond the more sensitive the bond is to interest rates.