The concept of constitutional supremacy asserts that the constitution is the highest law within a political system, guiding the legitimacy of all laws, institutions, and governmental actions. This principle ensures that any legislation or government action inconsistent with the constitution can be invalidated by judicial review. By establishing a clear hierarchy of laws, constitutional supremacy protects fundamental rights and freedoms, providing a framework for accountability within government practices. It also fosters stability and predictability in legal systems, enabling citizens to understand their rights and the boundaries of government authority in a democratic society.