Agency bonds are debt securities issued by federal government agencies, government-sponsored enterprises (GSEs) and certain government-related entities. These debt securities are also known by various other names such as agency debentures, GSE bonds, or mortgage-backed securities (MBSs).

The most commonly issued agency bond is the U.S. Treasury bond. These bonds are backed by the full faith and credit of the federal government, making them one of the government's safest investments. Other government-backed bond offerings include savings bonds, Treasury bills, Treasury notes, and Treasury Inflation-Protected Securities (TIPS).

Agency bonds borrow from private investors at a relatively low cost and the government uses the capital to fund certain programs or procedures. These bonds typically pay slightly higher interest rates than U.S. Treasury Bonds due to their lower default risk. However, they are still subject to market risks such as interest rate fluctuations and inflation, as with any other bonds.

Most agency bonds, including U.S. Treasury bonds, also come with tax advantages. These bonds are often exempt from state and local taxes and may even qualify for some tax-deferred plans such as 401(k) and IRAs.

Despite these benefits, there are risks inherent with any investment, including agency bonds, that must be taken into consideration. The most salient risk factor to consider when investing in agency bonds are interest rate risk.

Investing in a bond at a higher fixed rate can result in losses if prevailing market interest rates rise above the coupon rate of the bond. Additionally, the investor may also encounter credit risk from defaults, as a result of either financial or operational issues suffered by the agency that issues the bonds.

In conclusion, agency bonds are government backed debt securities that potentially provide higher rates of return than Treasury bonds, as well as various tax benefits. However, even these highly rated investments come with their own risks, including interest rate and credit risk, which must be taken into consideration before investing. It’s important for investors to assess their individual preferences and risk tolerance before making a decision about investing in these bonds.