Duolingo is a mobile eLearning platform that enables users to quickly learn languages and is currently the top-grossing app in the Education category on both Google Play and the Apple App Store. The company offers over 100 courses in more than 40 languages, with over 525 million users around the world. Duolingo was founded in 2011 by Luis von Ahn and Severin Hacker. As of 2021, the company is now trading under the ticker symbol “DUOL” on the Nasdaq exchange.