The King is a constitutional monarch who must remain politically neutral.
The head of state has “an important formal and ceremonial relationship” with Parliament, the monarchy’s official website says.
Charles’s role will consist, as did the late Queen’s, of assenting to Bills passed by Parliament on the advice of ministers. He will also give audiences to ministers, at which he may be “consulted, encourage and warn”, and summon new Parliaments on the Government’s advice, and open and close – or prorogue – each session of Parliament.