Which retailer first implemented collaborative filtering algorithms for product recommendations at scale, creating what is now considered the foundation of modern e-commerce personalization?

In the rapidly evolving retail landscape, certain innovations have revolutionized how consumers shop and how retailers understand their customers. Behind these transformations are pioneering technologies and algorithms that have redefined personalization in the digital retail space. Test your knowledge of the technical foundations that power modern retail experiences and the companies that led these breakthroughs.

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Amazon
Walmart
eBay
Alibaba