Judging by Amazon’s success, the recommendation system works. The company reported a 29% sales increase to $12.83 billion
Recommender systems are among the most popular applications of data science today. They are used to predict the "rating" or "preference" that a user would give to an item. Almost every major tech company has applied them in some form or the other: Amazon uses it to suggest products to customers, YouTube uses it to decide which video to play next on autoplay, and Facebook uses it to recommend pages to like and people to follow. What's more, for some companies -think Netflix and Spotify-, the business model and its success revolves around the potency of their recommendations.
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