The term 'Preamble' means an introduction to a Statute. The preamble is the introductory part of the Constitution. The Preamble cannot override the express provisions of the Act. It declares that the source of authority under the Constitution is the People of India and there is no subordination to any external authority. The preamble to the Indian Constitution is an integral part of the Constitution and can be amended but the basic structure cannot be amended. Secularism, Socialist and Integrity were added by the 42nd Amendment. Thus, the drafters of the Constitution also drafted the Preamble as a mirror and an introduction of the same. It would not be wrong to say that the spirit of the Constitution is present in the Preamble.