The primary function of a constitution in a democratic state is to establish the legal framework that governs the political and legal systems. Constitutions define the structure of government, delineate the separation of powers, and protect fundamental rights and liberties of citizens. They serve as a contract between the state and its people, ensuring that government authority is exercised lawfully. By providing a set of guiding principles, constitutions help maintain order, promote justice, and facilitate social stability within a democratic society.