Coupon rate is the interest rate paid on the bond.
Yield to maturity is the sum of the interest payments made on the bond until
maturity, at which time the bond itself is redeemable for its face value.
Yield to maturity takes into consideration the current market price of the
bond, the coupon rate, the time to maturity, and assumes interest payments
are reinvested at the bond's coupon rate.
For details on how these are calculated, google the terms and see what you
come up with. Investopedia.com and Wikipedia are decent places to start for
finance topics.
