This final paper consists of three chapters and an introduction and conclusion. The first chapter talks about the concept of state, which words it comes from and how the state is defined from different points of view. There are different theories about the origin of the state, but every state consists of essential elements, namely state territory, population and state authority. At the beginning of the section chapter entitled sovereignty, the concept of sovereignty is discussed, when this concept was created and how it developed. Sovereignty consists of two types of relations, external and internal sovereignty. The concepts of popular and national sovereignty are defined. Different states understood the concept of sovereignty differently. The Republic of Croatia is established by the Constitution as a democratic and social state in which national sovereignty is established. The last, third chapter is the most extensive, it explains the state as a global and political organization that makes important decisions on the direction and conduct of state policy. In states, authority is divided into the legislative, executive, judicial and administrative activities. Each of them has its own important tasks and persons who perform these tasks.