What is the definition of a system? How can I make people understand the difference between system and policy?

"System" refers to the organizational system of state organs, enterprises and institutions, such as school system, leadership system and political system. The system and mechanism have different headwords and scope of use. "Mechanism" refers to the generalization of general things by organisms, focusing on the mechanisms of various parts within things, that is, relationships. "System" refers to the organizational system, which is limited to state organs, enterprises and institutions with hierarchical relationships. In short, the system is the general name of the specific system and organizational system of state organs, enterprises and institutions in terms of institutional setup, affiliation, rights division and so on. For example, the economic system refers to the specific systems, ways and methods of organizing, managing and regulating the national economy. In addition, the word system has the mode of style, that is, the meaning of genre. For example, the system of poetry can be divided into ancient and modern systems. Policy is the code of conduct of state organs or political party organizations formulated by the state or political party to realize the line and tasks in a certain historical period. This policy has the following characteristics: ① class nature. Is the most fundamental feature of this policy. In a class society, policies only represent the interests of a specific class, never represent the interests of all members of society, and do not reflect the will of all. 2 correctness. The policies of any class and its subjects are right and wrong. 3 timeliness. Policy is a realistic policy implemented in a certain period of history and national conditions. 4 expressiveness. As far as the form of expression is concerned, policy is not a material entity, but an idea and information externalized as a symbol. By the competent department in words, words and other expressions. As a national policy, it is generally divided into two parts: internal and external. Domestic policies include financial and economic policies, cultural and educational policies, military policies, labor policies, religious policies and ethnic policies. Foreign policy is foreign policy.