Mumbai, formerly known as Bombay, is the capital city of the Indian state of Maharashtra. It is the most populous city in India and the seventh most populous city in the world, with an estimated population of over 20 million people in the greater metropolitan area. Mumbai is located on the west coast of India and has a deep natural harbor, making it a key port city. Mumbai is the financial, commercial, and entertainment capital of India. It houses the Bombay Stock Exchange (BSE), the Reserve Bank of India (RBI), and numerous multinational corporations. The city’s economy is diverse, with industries ranging from finance, entertainment, information technology, and manufacturing.