Mercury is a financial technology company that provides banking services and financial tools specifically designed for startups and small businesses. It offers FDIC-insured checking and savings accounts, virtual and physical debit cards, currency exchange, and domestic and international wire transfers. Mercury also integrates with various financial tools and provides features like cash flow analytics, invoicing, bill pay, and expense management to help businesses streamline their financial operations. The company aims to reimagine banking by offering a comprehensive and user-friendly financial stack.