Which recommendation algorithm technique is known for using the 'item-item similarity matrix' rather than comparing users to each other?

In today's competitive retail environment, recommendation systems are a crucial component of the digital shopping experience. These sophisticated algorithms analyze customer data to suggest products and services, driving higher engagement and sales. How well do you understand the mechanics behind these powerful retail tools that influence billions of dollars in purchasing decisions annually?

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Collaborative Filtering
Item-Based Collaborative Filtering
Content-Based Filtering
Association Rule Mining