The Indian Constitution, drafted by the Constituent Assembly led by Dr. B.R. Ambedkar, is a comprehensive framework that establishes India's political principles, government structure, and citizens' rights. Key features include fundamental rights, directive principles, a parliamentary system, and a flexible yet rigid amendment process, ensuring a balance between federal and unitary governance. It emphasizes sovereignty, secularism, democracy, and the provision of single citizenship, showcasing its ability to evolve and endure as a functioning document over the past 70 years.