Venmo is a mobile payment service that allows users to transfer money to friends and pay for purchases. It has grown rapidly since its founding in 2009, with annual revenue surpassing $200 million and payment volume booming. Venmo makes money through fees for instant transfers between Venmo and bank accounts (1% fee) and processing credit card and Pay with Venmo payments (3% fee). The company's growth has been driven by its popularity among cashless millennials who use it to split bills electronically with friends.