Which groundbreaking personalization technology did Amazon patent in 1998 that revolutionized product recommendations in online retail?

Amazon has transformed retail through innovative strategies, technologies, and business models. This trivia tests your knowledge about one of Amazon's breakthrough retail personalization techniques that fundamentally changed how online stores recommend products to customers. Understanding these innovations provides valuable insights into how data-driven personalization has reshaped consumer expectations and retail strategies across the industry.

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Collaborative filtering algorithm
Neural network prediction system
Dynamic pricing engine
Customer DNA profiling