Which innovative feature did Duolingo introduce in 2020 that revolutionized how users practice conversation skills with AI?

The language learning app market has exploded in the past decade, transforming how people approach language acquisition worldwide. From gamified interfaces to AI-powered conversation partners, these platforms have revolutionized an industry once dominated by textbooks and classroom instruction. Test your knowledge about this fascinating intersection of technology, education, and linguistics in this product trivia challenge!

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Duolingo Stories (short interactive narratives)
Duolingo Events (live virtual meetups)
Duolingo Characters (AI roleplay conversations)
Duolingo Immersion (augmented reality experiences)