Bonds are not a sound investment, it depends on what kind of bonds you invest in. There are also low-risk bonds and high-risk bonds. Low-risk bonds generally refer to national debt or government bonds and bonds with high credit rating, while high-risk bonds generally refer to unsecured credit bonds and bonds with low credit rating. These bonds are generally risky and mainly face higher default risk. For the default of bonds, it is usually impossible to guarantee the full payment of the face value of bonds and the payment of interest.