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Wikipedia definition
1. Recommender systemRecommender systems or recommendation systems (sometimes replacing "system" with a synonym such as platform or engine) are a subclass of information filtering system that seek to predict the 'rating' or 'preference' that a user would give to an item or social element they had not yet considered, using a model built from the characteristics of an item (content-based approaches) or the user's social environment (collaborative filtering approaches).
Read “Recommender system” on English Wikipedia
Read “レコメンダシステム” on Japanese Wikipedia
Read “Recommender system” on DBpedia

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