Answer:
A parliamentary system is a system of government in which the ministers of the executive branch are drawn from and accountable to the legislature, such that the executive and legislative branches are intertwined. In such a system, the head of government acts as de facto chief executive and chief legislator.
Parliamentary systems have no clear-cut separation of powers between the executive and legislative branches, which leads to a different set of checks and balances than are found in presidential systems.
Parliamentary systems usually have a clear differentiation between the head of government and the head of state, with the former being the prime minister or premier, and the latter often being a figurehead, either a president (elected by popular vote or by the parliament) or a hereditary monarch (often in a constitutional monarchy).