Is it necessary for employees of public institutions to pay social security?

People in institutions need to pay social security. However, there are units that pay fees, and individuals do not need to pay fees.

Social insurance is mainly through raising social insurance funds, coordinating and adjusting social insurance funds within a certain range, and giving necessary help to workers when they encounter labor risks. Social insurance provides basic living security for workers. Workers can enjoy social insurance benefits as long as they meet the conditions for enjoying social insurance, that is, they have established labor relations with employers or paid various social insurance premiums according to regulations. ?