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Duolingo Inc is a technology company that develops mobile learning platform to learn languages and is the top-grossing app in the Education category on both Google Play and the Apple App Store. Its products are powered by sophisticated data analytics and artificial intelligence and delivered with class art, animation, and design to make it easier for learners to stay motivated master new material, and achieve their learning goals. Its solutions include The Duolingo Language Learning App, Super Duolingo, Duolingo English Test: AI-Driven Language Assessment, Duolingo For Schools, Duolingo ABC, and Duolingo Math. It has three predominant sources of revenue; time-based subscriptions, in-app advertising placement by third parties, and the Duolingo English Test.
Host Hotels & Resorts owns 81 predominantly urban and resort upper-upscale and luxury hotel properties representing over 43,000 rooms, mainly in the United States. Host recently sold off the company's interests in a joint venture owning a portfolio of hotels throughout Europe and also sold other joint ventures that owned properties in Asia and the United States. The majority of Host's portfolio operates under the Marriott and Starwood brands.