This encyclopaedia tries to illustrate complete picture of various aspects related to library and information technology in twenty first century. Encyclopaedia of Library Information Technology for Twenty-first Century offers the most thorough treatment available on the application of library science techniques to information management problems.About the Editor: Shyama Balakrishnan, has been associated with the field of information science for nearly two decades. Dr. P.K.Paliwal, Ph.D. has also conducted several short term courses in India and aborad, some of them sponsored by UNESCO.