A city-state is an independent sovereign city that serves as the primary hub of political, economic, and cultural life within its contiguous territory. This concept stands in contrast to that of a regular state or country, which typically encompasses a capital city and additional urban centers, in addition to the countryside. Throughout history, numerous city-states have emerged in various regions of the world, including prominent examples such as Rome, Carthage, Athens, and Sparta, as well as the Italian city-states that flourished during the Medieval and Renaissance periods, such as Florence, Venice, Genoa, and Milan.