Which city is the most crowded in India?

 As of 2021, Mumbai is considered the most crowded city in India with a population of over 20 million people in the metropolitan area. Mumbai is known for its high population density, with an average of more than 20,000 people per square kilometer. The city is a hub for business, finance, and entertainment, and attracts a large number of migrants from across India and around the world. This has contributed to the city's high population density and overcrowding. Other cities in India with high population density include Delhi, Kolkata, and Chennai.