Explanation:

The basic structure doctrine is an Indian judicial principle that the Constitution of India has certain basic features that cannot be altered or destroyed through amendments by the parliament. Key among these "basic features", are the fundamental rights granted to individuals by the constitution. The doctrine thus forms the basis of a limited power of the Supreme Court to review and strike down constitutional amendments enacted by the Parliament which conflict with or seek to alter this "basic structure" of the Constitution.

The basic structure doctrine applies only to constitutional amendments. The basic features of the Constitution have not been explicitly defined by neither the Parliament nor the Judiciary, and the claim of any particular feature of the Constitution to be a "basic" feature is determined by the Court in each case that comes before it. The basic structure doctrine does not apply to ordinary Acts of Parliament, which must itself be in conformity with the Constitution.