The Prime Minister of the United Kingdom is the head of the UK government and is responsible for overseeing the operation of the government and the execution of its policies. The Prime Minister is usually the leader of the political party that has the most seats in the House of Commons, the lower house of Parliament. They are appointed by the Monarch and can be removed by a vote of no confidence. Prime Ministers are key figures in shaping national policy and representing the UK internationally. They lead the Cabinet, which is made up of senior government ministers, and are responsible for making decisions on various issues, including the economy, health, and education. Notable Prime Ministers include Winston Churchill, Margaret Thatcher, and Tony Blair.