What's the difference between machine insurance and social security?

Social security is welfare insurance, and it must be taken. This is the foundation. It is a wide coverage and low security, and it is a guarantee rather than a package. The five major social security risks are pension, medical care, unemployment, work injury and maternity, which can provide you with the most basic living security. Pension and medical care (reimbursement) are lifelong enjoyment. Social security alone is not enough. It must be supplemented by commercial insurance, which can improve your future quality of life and resolve risks.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.