In the modern era, the expansion and diversification of public services provided by the state, the increase in citizens' expectations from the state, and the advances in information and communication technologies have brought about the inadequacy of service delivery capacities in the field of public administration, the failure to meet needs and expectations, and citizens' questioning of public administration. In order to reduce and eliminate the effects of this negative situation, new management models have been put forward as a result of the policies that include the private sector, civil society, and other actors in the field of public administration, through functional and structural changes and transformations by political power holders. The reason for the existence of new management models is to reveal how factors such as the rights of public officials and wage systems, the relative weight of politics and bureaucracy, the positioning of central and local management institutions, the dimensions of centralization and decentralization will be. In this study, firstly, the concepts and characteristics of bureaucracy and public administration are tried to be explained in general terms and then the characteristics of traditional public administration in the field of public administration are mentioned. Then, the modern methods and approaches in bureaucracy, which constitute the subject of the study, are evaluated in detail and it is tried to be explained how public administration has changed.