This article describes the basic concepts of library networks, objectives of library networks, need of library networking and coverage of networks, major Library networks in India, such as ADINET, DELNET, INFLIBNET, MANLIBNET, MALIBNET and other countries, such as AARLIN, CALIS, JANET, JISC, OCLC, and RLG. The reason of this article is to encourage librarian to rethink library networking and sharing, cooperation, and overall execution.