The Indian Constitution is defined by several core founding principles, many of which are encapsulated in its Preamble and elaborated throughout its articles. These principles reflect the vision of its framers for a just, equitable, and democratic society:

1. Sovereignty: India is an independent state, free from external control, with the ultimate authority resting with its people.
2. Socialism: (Added by 42nd Amendment) The state aims to achieve social and economic equality, reduce disparities, and ensure a decent standard of living for all citizens.
3. Secularism: (Added by 42nd Amendment) The state has no official religion, treats all religions equally, and guarantees freedom of religion to all individuals.
4. Democracy: India is a democratic republic, where the government is by the people, for the people, and of the people, exercised through elected representatives.
5. Republic: The head of the state (President) is elected, not hereditary, signifying that political sovereignty rests with the people.
6. Justice: The Constitution guarantees social, economic, and political justice for all citizens, aiming to eliminate all forms of exploitation and discrimination.
7. Liberty: It assures liberty of thought, expression, belief, faith, and worship, essential for individual growth and a vibrant public sphere.
8. Equality: It ensures equality of status and opportunity for all, prohibiting discrimination on grounds of religion, race, caste, sex, or place of birth.
9. Fraternity: It promotes a sense of common brotherhood among all Indians, assuring the dignity of the individual and the unity and integrity of the nation.
10. Federalism: It establishes a dual polity with a division of powers between the Union and State governments, though with a strong central bias.
11. Parliamentary System: The executive is responsible to the legislature, ensuring accountability and responsiveness.
12. Independent Judiciary: An impartial judiciary acts as the guardian of the Constitution and protector of fundamental rights.