Resource sharing is nothing but sharing of library resources by certain participating libraries among themselves on the basis of the principle of co-operation. This is applicable in sharing of documents, manpower, services, space and equipments. This paper mainly highlights for What is Resource Sharing?, Why Resource Sharing?, Ways, Means & Methods: Definition, Objectives,Needs,Areas for Co-Operation & Resource Sharing, Components, Requirements, Concept, Advantages, Criticism, Barrier, Steps to Promote Resource Sharing through Network, Library Consortium and their types & functions, Advantages and disadvantages.