A capital city is the primary city in a country or region where the government is based. It typically houses important government buildings, such as the parliament, presidential palace, and various ministries. Capital cities often serve as the political, cultural, and economic center of the nation. In many countries, the capital city is also a hub for international diplomacy, hosting embassies and consulates from other nations. Some well-known capital cities include Washington, D.C. in the United States, London in the United Kingdom, and Tokyo in Japan. Each capital reflects the history and identity of its country.