The Constitution of India came into effect on January 26, 1950, and is the world's longest constitution. It is considered the supreme law of the country. It provides a framework for all government systems and laws. The Constitution also defines the fundamental rights and duties of the citizens of India. Key leaders of the Union Government such as the President and the Prime Minister derive their powers from the Constitution. As of the year 2020, the Constitution has undergone a total of 104 amendments.