A capital city is the administrative center of a country or region, often housing the government and its officials. It typically serves as the focal point for political activities and decision-making. For example, Washington, D.C. is the capital of the United States, while Tokyo serves as the capital of Japan. Capital cities are often characterized by their cultural significance, historical landmarks, and economic importance. They may also be home to various institutions, such as embassies and international organizations. Cities like London and Paris are not only capitals but also major global cities known for their influence and heritage.