The document summarizes the key features of the Indian constitution. It notes that the Indian constitution is the longest written constitution in the world, originally containing 395 articles across 8 schedules and 22 parts and now containing 448 articles across 25 parts and 12 schedules. It highlights some of the main features borrowed from other countries that influenced the Indian constitution, including parliamentary democracy from the UK, fundamental rights and an independent judiciary from the US, fundamental duties from the USSR, and the concept of directive principles of state policy from Ireland. The constitution establishes India as a sovereign, socialist, secular, democratic republic with a parliamentary form of government, federal structure, and guarantees of fundamental rights.