It lays down the basic structure of the government under which its people are to be governed. It establishes the main organs of the government - the executive, the legislature and the judiciary.
The Constitution not only defines the powers of each organ, it demarcates the responsibilities of each. It regulates the relationship between the different organs and between the government and the people.
A Constitution is superior to all the laws of the country. Every law enacted by the government has to be in conformity with the Constitution.
The Constitution lays down the national goals of India - Democracy, Socialism, Secularism and National Integration.
It spells out the rights and duties of the citizen