Constitutionalism is the principle that government authority is derived from and limited by a constitution, which serves as a foundational legal framework for governance. It ensures that power is distributed and regulated to protect individual rights and liberties, preventing arbitrary rule. By establishing checks and balances among branches of government, constitutionalism promotes accountability and the rule of law, fostering a stable and just society. Ultimately, it embodies the idea that government should operate within the bounds of the law, reflecting the will of the people.