The primary function of a constitution in a political system is to outline the fundamental principles and structures of governance. It serves as the supreme law, establishing the framework for how power is distributed and exercised. Constitutions often delineate the roles and responsibilities of different government branches, protect individual rights, and provide a basis for legal interpretation. In doing so, they create a system of checks and balances that prevents abuse of power. Furthermore, they typically include a mechanism for amendment to adapt to changing societal needs over time.