The United Kingdom is a constitutional monarchy. King Charles III is the head of state but not the head of government — that role belongs to the Prime Minister. The monarch's functions are largely ceremonial: opening Parliament each year with the King's Speech (written by the government), giving Royal Assent to bills passed by Parliament, appointing the Prime Minister, and acting as a focus of national unity.
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The monarch is also the head of the Commonwealth, head of the armed forces, and Supreme Governor of the Church of England. Royal duties include hosting state visits, awarding honours, and meeting weekly with the Prime Minister. Constitutional convention requires the monarch to remain politically neutral.
You may be asked who is head of state in the UK (the monarch), or whether the King takes part in political decisions (he does not).
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