Parliamentary system

World's states coloured by systems of government:
Parliamentary systems: Head of government is elected or nominated by and accountable to the legislature
  Constitutional monarchy with a ceremonial monarch
  Parliamentary republic with a ceremonial president
  Parliamentary republic with an executive president
Presidential system: Head of government (president) is popularly elected and independent of the legislature
  Presidential republic
Hybrid systems:
  Semi-presidential republic: Executive president is independent of the legislature; head of government is appointed by the president and is accountable to the legislature
  Assembly-independent republic: Head of government (president or directory) is elected by the legislature, but is not accountable to it
Other systems:
  Theocratic republic: Supreme Leader holds significant executive and legislative power
  Semi-constitutional monarchy: Monarch holds significant executive or legislative power
  Absolute monarchy: Monarch has unlimited power
  One-party state: Power is constitutionally linked to a single political party
  Military junta: Committee of military leaders controls the government; constitutional provisions are suspended
  Provisional government: No constitutionally defined basis to current regime
  Dependent territories or places without governments
Note: this chart represents the de jure systems of government, not the de facto degree of democracy.
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A parliamentary system, or parliamentary democracy, is a form of government where the head of government (chief executive) derives their democratic legitimacy from their ability to command the support ("confidence") of a majority of the legislature, to which they are held accountable. This head of government is usually, but not always, distinct from a ceremonial head of state. This is in contrast to a presidential system, which features a president who is not fully accountable to the legislature, and cannot be replaced by a simple majority vote.

Countries with parliamentary systems may be constitutional monarchies, where a monarch is the head of state while the head of government is almost always a member of parliament, or parliamentary republics, where a mostly ceremonial president is the head of state while the head of government is from the legislature. In a few countries, the head of government is also head of state but is elected by the legislature. In bicameral parliaments, the head of government is generally, though not always, a member of the lower house.

Parliamentary democracy is the dominant form of government in the European Union, Oceania, and throughout the former British Empire, with other users scattered throughout Africa and Asia. A similar system, called a council–manager government, is used by many local governments in the United States.