Methods and Algorithms of Recommender Systems(RS)

The recommender systems are systems that help users to find and select intended items.It s natural that these systems are not able to offer without proper information about the users and their intended items (for example, movies, music, books, etc.). Different definitions are provided for recommender systems. For example, the the summary definition of Mr. Ting-peng Liang in 2007, which describes recommender systems as a subset of decision support systems, defines them as information systems that can analyze past behaviors and provide recommendations for current issues.