Metropolitan areas are regions that encompass a densely populated urban core and its less-populated surrounding territories, sharing industry, infrastructure, and housing. These areas often include multiple municipalities and are characterized by significant economic and social interactions among their residents. Examples include New York City and Los Angeles, which serve as cultural and economic hubs. The concept of metropolitan areas helps in understanding urbanization and regional planning. They are crucial for analyzing demographic trends, transportation systems, and public services. As cities expand, the definition of metropolitan areas evolves, reflecting changes in population and economic activity.