What is presidential government and parliamentary government?

Parliamentary and presidential government are the two principal models by which democracies are organized. In a parliamentary system, the chief executive and cabinet are responsible to the legislature: the legislature chooses them and the legislature can remove them from office. In a presidential system, the chief executive is a single person, popularly elected for a constitutionally prescribed period of time, who, under normal circumstances is not subject to removal by the legislature (Lijphart 1984, 1992).
A pa...