Which pioneering recommendation system, launched in 1998, first used collaborative filtering at scale and became known for the phrase 'Customers who bought this item also bought'?

The digital transformation of retail has been marked by numerous technological breakthroughs, but few have changed consumer behavior as dramatically as recommendation systems. These AI-driven tools analyze customer behavior to suggest products they might like, increasing sales while enhancing the shopping experience. Test your knowledge about the origins and evolution of these now-ubiquitous systems that shape our online shopping journeys every day.

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• Amazon's ItemToItem Collaborative Filtering
• Netflix's Cinematch Algorithm
• Google's PageRank System
• eBay's Related Items Feature

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