"U.S. 3-year treasury bond refers to a 3-year fixed-income bond issued by the U.S. government. The bond is issued to raise funds for government expenditures, such as infrastructure construction, social welfare, and defense expenditures.

The coupon rate on the 3-year U.S. Treasury bond is fixed and determined when the bond is issued. Bond holders earn interest income based on the coupon rate, which is usually paid twice a year. When the bond matures, bondholders get their principal back.

Compared with other types of bonds, the US 3-year Treasury bond has a shorter maturity, so the risk is relatively low, but the corresponding yield is also relatively low. In addition, the U.S. government has a high credit rating, which means that the probability of debt default is low.

The market value of the US 3-year Treasury bond will be affected by many factors, such as the economic environment, inflation rate, monetary policy, etc. Under normal circumstances, the market demand is strong during economic prosperity, bond prices rise, and interest rates fall; while in economic recession, market demand decreases, bond prices fall, and interest rates rise.

In summary, the US 3-year Treasury bond is a relatively safe investment vehicle for investors who want fixed income in the short term. However, investors should comprehensively consider their investment objectives, risk appetite, market environment and other factors when choosing whether to invest in US 3-year treasury bonds. "