The doctrine of 'Basic Structure' is a judicial principle that holds that certain fundamental features of the Constitution of India are beyond the amending power of the Parliament. This doctrine was established by the Supreme Court in the historic case of Kesavananda Bharati v. State of Kerala (1973). The court, by a narrow majority, ruled that while Parliament has the power to amend any part of the Constitution, it cannot use this power to alter or destroy its "basic structure" or framework. This principle acts as a crucial check on the legislative power of Parliament.