Old-age insurance, the full name of social basic old-age insurance, is a social insurance system established by the state and society in accordance with certain laws and regulations to solve the basic life of workers who reach the working age limit stipulated by the state and terminate their labor obligations or quit their jobs because of old age. It is an important part of the social security system and one of the five most important social insurances. The purpose of endowment insurance is to protect the basic needs of the elderly and provide them with a stable and reliable source of life.

Medical insurance refers to the insurance that pays the insurance premium on the condition that the medical behavior agreed in the insurance contract occurs, and provides protection for the medical expenses of the insured during the medical treatment.

Medical insurance has the basic characteristics of social insurance, such as compulsion, mutual assistance and sociality. Therefore, the medical insurance system is usually enforced by national legislation and a fund system is established. The expenses are paid jointly by the employer and the individual, and the medical insurance premium is paid by the medical insurance institution to solve the medical risks caused by the illness or injury of the employees.