Recommendation system

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A recommendation system is a software program which attempts to narrow down selections for users based on their expressed preferences, past behavior, or other data which can be mined about the user or other users with similar interests.

Classification

The current generation of recommendation methods can be broadly classifed into the following three categories, based on how recommendations are made:
1. Content-based recommendation systems.
2. Collaborative recommendation systems.
3. Hybrid recommendation systems.