Constitutional law is the body of law that interprets and applies the provisions of a constitution. It defines the fundamental principles of a state, the structure and powers of government, and the rights and freedoms of citizens. Key concepts include: Sovereignty: The supreme authority of the state. Separation of Powers: Dividing governmental power among legislative, executive, and judicial branches to prevent tyranny. Checks and Balances: Mechanisms allowing each branch of government to limit the powers of the other branches. Federalism: A system where power is divided between a national government and regional (state) governments. Judicial Review: The power of courts to review laws and actions of the government to determine their constitutionality. Fundamental Rights: Basic human rights and freedoms guaranteed to citizens, such as freedom of speech, religion, and assembly.