Which recommendation algorithm famously helped Netflix improve its suggestion accuracy by 10% through a $1 million prize competition in 2009?

Recommendation systems have transformed how retailers connect products with consumers. These AI-powered systems analyze customer behavior, purchase history, and preferences to suggest items shoppers might like. But how much do you know about the technology powering these personalized shopping experiences? Test your knowledge about the sophisticated algorithms and business impacts of retail recommendation systems that drive sales across ecommerce platforms worldwide.

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Matrix Factorization (BellKor's Pragmatic Chaos algorithm)
Random Forest Collaborative Filtering
Neural Network Deep Learning System
K-Nearest Neighbors Content-Based Filtering