Which recommendation strategy did Netflix famously offer $1 million to improve through their 'Netflix Prize' competition in 2009?

Major streaming platforms rely on sophisticated recommendation algorithms to keep viewers engaged and discovering new content. These systems analyze viewing patterns, preferences, and even production details to suggest what you might want to watch next. But how well do you understand how these entertainment recommendation engines actually work? Test your knowledge about the technology that shapes your viewing habits and the film & television industry at large.

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Collaborative filtering algorithm that predicts user ratings for films
Content categorization system that tags shows by emotional response
Viewing time optimization that determines ideal episode lengths
Cross-platform recommendation engine that works across multiple devices