What is the capital city of the UK?

London is the capital city of the United Kingdom and serves as the political, economic, and cultural center of the country. It is the largest city in the UK and hosts the main institutions of government, including the Houses of Parliament and the official residence of the Prime Minister, 10 Downing Street. Additionally, London is an international hub for finance, education, and tourism, attracting millions of visitors each year. The other cities listed—Edinburgh, Cardiff, and Belfast—serve as capitals for Scotland, Wales, and Northern Ireland, respectively, but none hold the status of the capital of the entire UK. This distinction highlights London's significance within the UK and its role on the global stage.