The present day knowledge or information-based society is making extensive use of information for all kinds of activities. It is the development in communication technology, which took place since late eighties that provided and impetus to the use of computers in various segments of society and libraries, which literally caused revolution Internet based innovations and applications are emerging daily and end is not in sight. Information revolution is ultimately benefiting the whole world this is happening because of increasing utilization of computers and communication in every area. Library and information science area has also gone tremendous changes. The present work truly Encyclopeadic in nature encompasses a great treasure of terms and phrases explained in simple and clear way pertaining to computer and library science. The information is gathered from authoritative sources as such the definitions and explanation is reliable and authentic. Amidst the plethora of similar literature this dictionary is unique, amalgating the latest research and developments in the field no doubt the present Endeavour will satiate the present Endeavour will satiate the quest of one and all