What does the first social security file mean?

What does the first social security file mean? The first file is the most basic payment grade. If you increase one gear, the compensation will also increase.

First, social security is divided into five files and eight files. The higher the grade, the higher the payment base.

Second, social security includes pension, medical care, work injury, unemployment and maternity insurance.

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