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A prime minister is the head of the cabinet and the leader of the ministers in the executive branch of government, often in a parliamentary or semi-presidential system. Under those systems, a prime minister is not the head of state of their respective state nor a monarch; rather the prime minister is the head of government, serving typically under a monarch in a hybrid of aristocratic and democratic government forms or a president in a republican form of government.

In parliamentary systems fashioned after the Westminster system, the prime minister is the presiding and actual head of government and head of the executive branch. In such systems, the head of state or their official representative (e.g., monarch, president, governor-general) usually holds a largely ceremonial position, although often with reserve powers.