Which algorithmic invention, first widely implemented in 1998, revolutionized e-commerce by allowing websites to make personalized product recommendations based on customer behavior patterns?

The world of e-commerce has seen numerous innovations that have shaped how we shop online today. From secure payment systems to revolutionary algorithms, these inventions have transformed digital retail. This trivia question focuses on a breakthrough technology that fundamentally changed how customers discover and purchase products online. Test your knowledge about this pivotal e-commerce invention!

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Collaborative Filtering Recommendation Systems
Blockchain Payment Verification
Cross-Site Cookie Tracking
Quantum Encryption Shopping Carts