推荐系统属于信息过滤的一种应用。推荐系统能够将可能受喜好的信息或实物（例如：电影、电视节目、音乐、书籍、新闻、图片、网页）推荐给用户。

Recommender 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.