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 recommendations.
2. Collaborative recommendations.
3. Hybrid recommendations.

Content-based recommendation

In Content-based recommendation, the user receives recommendations based on his past preferences.

Collaborative RS

Collaborative recommendation systems recommend items that people with similar taste preferred in the past.

Hybrid RS

Hybrid systems use a combined content-based and collaborative approach.

References

Toward the Next Generation of Recommender Systems: A Survey of the State-of-the-Art and Possible Extensions