This document discusses library consortia. It begins by defining a consortium as separate groups coming together for a common purpose. Consortia originated in economics as companies grouping resources under single management for joint operations. The document then traces the history of consortia from the 17th century relating to marriage through later applications in manufacturing and banking. It describes the phases of consortia development from interlibrary loan to digital libraries. Examples of Indian library consortia are provided across various subject areas. The roles and workflows of consortia are outlined including publishers, aggregators, governance, and user access. Objectives of the study and suggestions for improvements are presented, advocating strengthening existing consortia and resource sharing networks.