This book studies, analyses and presents some fundamental concepts associated with the field of Library and Information science and depicts its utmost significance in modern times. This area of study has been progressing for decades. It is an amalgamation of the techniques of library science with the technological evolution of information science. Some major aspects of library and information science include information retrieval, bibliographic database management, knowledge organization, etc. This textbook delves into the significant theories and practical applications of this field. It is a complete source of knowledge on the present status of library and information science. This book, with its detailed analyses and data, will prove immensely beneficial to professionals and students involved in this area at various levels.