Constitutional conventions are unwritten practices that guide the behavior of political actors in a government. They are not legally enforceable but are considered essential for the functioning of a political system, particularly in parliamentary democracies. These conventions help clarify roles and responsibilities, ensuring that government operates smoothly and effectively. For example, in the United Kingdom, it is a convention that the Prime Minister must be a member of the House of Commons. While this is not stated in any law, it is widely accepted and followed, reflecting the importance of conventions in maintaining political stability and accountability.