The public sector is most simply defined as a set of different activities for the purpose of satisfying the needs and interests of citizens with an emphasis on state supervision. The development of the public sector through history is inspired by the industrial revolution, enlightened absolutism, educated citizens, and the desire for a simpler and better life. With the introduction of machines in production, trade development, health care, population growth and growth of cities, the demands of the citizens and the obligations of the state towards them increased. The development of new institutions has further burdened the state and has given certain jobs to the private sector, but considering the need to establish supervision over it, there is a public sector within which the interests and needs of citizens can be realized. The public sector system is a whole made up of parts, which means their interconnection, but there is also the connection of the system to the environment which leads to the creation of certain relationships.