Which innovative feature, first introduced by Duolingo in 2016, revolutionized language learning apps and was later widely adopted across the industry?

The language learning industry has transformed dramatically in the digital age. Once dominated by textbooks and classroom instruction, the market has shifted toward interactive mobile applications that use AI and gamification to engage learners. This poll tests your knowledge about a significant product development milestone in the modern language learning landscape that changed how millions approach language acquisition.

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Chatbots that simulate real conversations with native speakers
Spaced repetition algorithms that optimize vocabulary retention
Voice recognition technology for pronunciation feedback
Gamified learning with points, levels, and leaderboards