India follows constitutional democracy which offers a clear separation of powers. The judiciary is independent of the other two branches with the power to interpret the constitution. Parliament has the legislative powers. Executive powers are vested in the President who is advised by the Union Council of Ministers headed by the Prime Minister. The constitution of India vested the duty of protecting, preserving and defending the constitution with the President as common head of the executive, parliament, armed forces, etc.—not only for the union government but also the various state governments in a federal structure. All three branches have "checks and balances" over each other to maintain the balance of power and not to exceed the constitutional limits.