The politics of Papua New Guinea takes place in a framework of a parliamentary representative democratic multi-party system, whereby the Prime Minister is the head of government. Papua New Guinea is an independent Commonwealth realm, with a governor-general, nominated by the National Parliament, acting as head of state. Executive power is exercised by the government. Legislative power is vested in both the government and parliament.
Papua New Guinea is one of the most heterogeneous nations in the world.There are hundreds of ethnic groups indigenous to Papua New Guinea, the majority being from the group known as Papuans, whose ancestors arrived in the New Guinea region tens of thousands of years ago. The other indigenous peoples are Austronesians, their ancestors having arrived in the region less than four thousand years ago.