What unique product feature did Duolingo introduce in 2020 that revolutionized its customer experience and significantly boosted user engagement?

Duolingo has become one of the most popular language learning apps worldwide, but how much do you know about this product's journey to success? This poll explores an interesting aspect of Duolingo's product history and customer experience that helped shape its widespread adoption. Test your knowledge about this language learning phenomenon!

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• The gamified 'streaks' system with daily challenges
• Character-based storylines with Duo the owl and friends
• AI-powered speaking exercises with pronunciation feedback
• Peer-to-peer language exchange feature

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