The purpose of this research is to present a detailed exploration and understanding of the system of ideas that describe the “Smart City”, on a theoretical and applied level, as demonstrated in the successful examples of sustainable urban life in our country and abroad. The first part lists the various definitions and key features that make up its structure.  Then, in the second part, 5 cases of “Smart Cities” are analyzed, two of which are in the country and the rest abroad. The important geo-political elements are mentioned and the technical initiatives and projects that have been or will be implemented within the model for the sustainable development of cities and the citizens' living standard are presented.