Urban cities are a hub of modernization and urbanization. There are several synonyms that can be used to describe urban cities such as metropolis, megacity, city center, cosmopolitan city, and urban area. The term metropolis refers to a large and populous city whose economic, political, and cultural activities have a significant impact on global affairs. Megacity denotes an urban area with over 10 million inhabitants. City center refers to the central area of a city where most of the commercial and administrative activities take place. Cosmopolitan city usually has a diverse population from different cultures and nationalities, while urban area refers to a densely populated and urbanized geographic region.