The United Kingdom (UK) is a country located off the northwest coast of Europe. It is made up of four countries: England, Wales, Scotland, and Northern Ireland. The UK is a constitutional monarchy, with Queen Elizabeth II as its head of state, and is a member of the European Union (EU). The official language of the UK is English, and the capital city is London. The UK has a population of around 66 million people, and is known for its rich history, culture, and natural beauty. The country has a developed economy, with a mix of industries, including finance, manufacturing, and services.