FIIs started investing in India in 1993 after the Indian stock market opened to foreign investors. FIIs must register with SEBI and comply with RBI regulations. They can include pension funds, mutual funds, insurance companies, banks, and more. FIIs bring foreign currency into India which increases rupee liquidity and lowers borrowing costs, fueling economic growth. However, they also introduce volatility in stock prices as they buy and sell large numbers of shares. Massive withdrawals of funds by FIIs have contributed to crashes of the Indian stock market.