Each book in this series has been written to provide in -depth knowledge of the basics of Library and Information Science and is in accordance with the B.Lib.Sc. syllabus of major Indian universities imparting the said course. To make this work more comprehensible for the students, the books under this series have been written in Question-Answer format and the language used is very simple, easy and understandable. This series has been divided into six parts, each of which is dedicated to one basic aspect of library and information science. The present series consists of six books in all, its first part deals with Learn Library and Society, second is Learn Library Management, third is Learn Library Classification (Theory), fourth being Learn Library Classification (Theory), fifth, Learn Reference Services, Information Services and Their Sources and the last and sixth book is Learn Computer Basics and its Application in Libraries. This gives a comprehensive and complete coverage to almost all the syllabi of most of the Indian universities imparting Bachelors' Degree in Library and Information Science (B. Lib. Sc.). It is hoped that this book shall find its place with anyone who is interested to know and learn more about the basics of library and information science. Not only the students, but the teachers of library and information science can derive equal benefit from this series. The books are equally suited to librarianship, library science students and library staff seeking to upgrade their skills.