Which groundbreaking linguistic feature was first widely adopted by retail chatbots around 2018 that dramatically improved their effectiveness?

The intersection of linguistics and retail technology has revolutionized customer service through AI-powered chatbots. These digital assistants employ natural language processing, sentiment analysis, and machine learning to create more human-like interactions. As linguistic capabilities in chatbots continue to advance, retailers are seeing significant shifts in customer engagement patterns and service expectations. Test your knowledge about this fascinating evolution of retail communication technology!

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Context retention across multiple conversation turns
Automatic language translation for international customers
Voice recognition capabilities for phone-based support
Emoji sentiment analysis for customer satisfaction tracking