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Duolingo develops digital learning products designed to make education broadly accessible. Its app offers short, interactive lessons for language study, while its wider portfolio includes offerings such as the Duolingo English Test, math, music, and chess. The company describes using research-informed teaching methods, game-like practice, and personalization to support learning habits. Available courses and features vary by product and language. Learners should review the current course content, assessment purpose, device requirements, and paid-plan terms that apply to their needs.