Which groundbreaking personalization algorithm, launched in 1998, became known as the 'item-to-item collaborative filtering' system that revolutionized e-commerce recommendations?

In the evolving landscape of e-commerce, personalization algorithms have revolutionized how retailers interact with consumers. These sophisticated systems analyze browsing history, purchase patterns, and demographic data to create tailored shopping experiences. One company pioneered a particularly influential recommendation algorithm that fundamentally changed retail forever. Test your knowledge of this pivotal moment in retail technology history that set new standards for personalization across the industry.

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Amazon's recommendation engine
Netflix's Cinematch algorithm
eBay's Cassini search system
Walmart's Store of the Community system