The aim of the graduate thesis is to clarify the basic concepts related to the state and state sovereignty. Namely, to achieve the same, it is necessary to encompass the historical course of the founding of the state that is known today, as well as the genesis of sovereignty itself. According to the above, the work consists of six units. The first ensemble encompasses introductory remarks, and the second ensemble explains the conceptual definition of the state, its historical "story", its elements and its function. Furthermore, the third part of the work covered the classification of the State and the characteristics of the state power. The fourth part of the work is defined by the definition and understanding of sovereignty, its development through the past, as well as the definition of its species. Considering that the area covered will not be completely unresponsive to international law, the fourth set of works implies the role of the state and sovereignty in international law. Also, the fifth part of the paper presents the "celebration" of state sovereignty in the 21st century. The sixth chapter, as a last, brings a conclusion about the whole graduate thesis.