Which innovative feature, first introduced by a major language learning platform around 2016, revolutionized the industry by allowing users to practice conversation skills with AI?

The language learning app market has seen remarkable innovation in recent years, with companies constantly seeking new features to differentiate themselves and enhance user engagement. One particular technological advancement revolutionized the industry around 2016-2017, dramatically improving user retention and changing how people practice new languages. Test your knowledge about this game-changing product innovation that transformed the competitive landscape.

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AI-powered chatbots with natural language processing for realistic conversations
Augmented reality translation of physical text through smartphone cameras
Gamified vocabulary competitions between users across different countries
Neural machine translation that improved accuracy by 60% over previous systems