The U.S. Treasury department issues debt obligations, including long-term bonds. U.S. bonds range in length, from short-term to very long-term. U.S. bonds are debt obligations by the government. The government issues U.S. bonds for current spending needs, with the intention to pay back the total plus interest over the life of the debt instrument. U.S. bonds are quite important as many other interest bearing securities are priced off this heavily traded security. Since many investors around the world watch the rates of U.S. bonds for signs of economic strength or weakness, it is important for all investors to be aware of the interest rate environment.