Why is Singapore referred to as a city-state?

Singapore is referred to as a city-state because it is an autonomous political entity that consists of a city and its surrounding territory. The Republic of Singapore, occupying the southern part of Singapore Island, has grown to such an extent that the city and the nation have become essentially one entity. This unique status means that the city itself is the capital and the primary focus of governance and administration. Singapore functions as a unitary parliamentary democracy, with its government managing all aspects of the state, from the city's infrastructure to its national policies.12345