The article deals with smart city concepts and their theoretical definitions. A smart city must have a smart social system integrated into the city’s activities and management processes. The smart city is defined in the scientific literature by various dimensions. This article examines three main smart city dimensions: community, economy, public management. A smart city is characterized by the empowerment of representatives of the city community to actively participate in the management of the city’s operational processes. The smart economy quickly and resourcefully uses new opportunities, implements knowledge and innovations. Smart public management makes timely decisions and promptly implements them.