Robinhood is a brokerage firm that offers a free mobile app for trading stocks and other financial products with no fees or minimum balances. Key features include charts, notifications, authentication options, and support for more complex order types. The company raises funds through interest on uninvested balances, monthly subscriptions to Robinhood Gold for margin trading, and by keeping costs low without physical locations. Founded in 2013, Robinhood now has over 3 million users who are predominantly young and new to investing. The app's easy-to-use interface has helped it gain popularity by lowering barriers to the market.