Zahra Asadpour - Student of department of IT, Zand non-profit higher education institution, Shiraz, Iran
Navid Mahmoodabadi - Lecturer of department of IT, Zand non-profit higher education institution, Shiraz, Iran
Ehsan Zarei - Member of young researcher club, Shiraz, Iran

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.