Page "Recommender system" Paragraph 22
from
Wikipedia
The recommender system compares the collected data to similar and dissimilar data collected from others and calculates a list of recommended items for the user.
Several commercial and non-commercial examples are listed in the article on collaborative filtering systems.
Recommender systems are a useful alternative to search algorithms since they help users discover items they might not have found by themselves.
Interestingly enough, recommender systems are often implemented using search engines indexing non-traditional data.
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