Which linguistic analysis technology has most significantly improved retail chatbots' ability to understand customer intent in the past five years?

In today's competitive retail environment, understanding how language affects consumer behavior has become a critical aspect of product development and marketing strategy. Retailers are increasingly using linguistic analytics to optimize product descriptions, customer service interactions, and brand messaging. This trivia question explores an innovative linguistic technology that has revolutionized retail customer engagement in recent years.

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Named Entity Recognition (NER)
Transformer-based Natural Language Understanding (NLU)
Sentiment Analysis with Recurrent Neural Networks
Rule-based Syntactic Parsing