A*city*is a large and permanent*human settlement.[1][2]*Although there is no agreement on how a city is distinguished from a*town*in general English language meanings, many cities have a particular administrative, legal, or historical status based on local law.
Cities generally have complex systems for sanitation, utilities, land usage, housing, and transportation. The concentration of development greatly facilitates interaction between people and businesses, benefiting both parties in the process, but it also presents challenges to managing*urban growth.[3]
A big city or*metropolis*usually has associated*suburbs*and*exurbs. Such cities are usually associated with*metropolitan areas*and*urban areas, creating numerous business commuters traveling to urban centers for employment. Once a city expands far enough to reach another city, this region can be deemed a*conurbation*or*megalopolis. In terms of population, the largest city proper is*Shanghai, while the fastest-growing isDubai.[4]