Which pioneering technology, first deployed in retail in 2006, revolutionized personalization by analyzing browsing patterns and purchase history to create 'item-to-item' collaborative filtering?

The development of personalized shopping experiences has transformed retail over the past decade. One groundbreaking invention in retail personalization algorithms changed how businesses interact with customers forever. Test your knowledge about this technological innovation that revolutionized retail by enabling unprecedented levels of customization based on customer behavior patterns.

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Amazon's recommendation engine
Walmart's Smart Shelf system
Target's Guest ID algorithm
Apple's Genius Bar technology