Synopsis The present era is very significant and crucial due to unprecedented expansion of Universe of Knowledge at all levels and advancements in the field of Information and Communication Technology (ICT) enabling to access to information worldwide and in turn this has become a real challenge for library professionals.Keeping in view of emerging challenges in Library and Information Science, the present publication is being brought out to meet the diverse needs of LIS professionals on latest trends, developments and innovations taking place in digital environment.The aim of multi-volume Encyclopaedia of Library Science in New Millennium is to encapsulate up-to-date information on the topics covered on different aspects of LIS education and library services rendered by the library to the community in present scenario.