Prime minister
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In parliamentary systems, a prime minister is the head of government. He or she is in charge of day-to-day functions of the government, while the head of state, like the monarch or president, exercises mostly ceremonial duties (unless they are part of a system wherein the head of state and head of government share power). In some systems the prime minister is appointed by and serves at the pleasure of the head of state, but in most cases he or she must rely on the confidence of parliament to stay in power.
