A metropolis is a large and densely populated urban area that serves as a significant economic, political, and cultural center. These cities often have diverse populations and offer a wide range of services, industries, and amenities. Examples of metropolises include New York City, Tokyo, and London, each known for their unique characteristics and global influence. Metropolises typically feature extensive infrastructure, including transportation systems like subways and buses, which help connect different neighborhoods. They also host major institutions such as universities, hospitals, and corporations, making them vital hubs for innovation and opportunity.