This book outlines the processes and applications of digital library in detail. It provides deep insights into this field. Digital library refers to an electronic collection of texts, audio, video, visuals, etc. It is an information retrieval system and is arranged, organized and stored in the same way as a physical library. This text is a compilation of chapters that discuss the most vital concepts in the field of digital library. Different approaches, evaluations and methodologies have been included in it. Also included in this text is a detailed explanation of the various concepts of the area. This textbook is meant for students who are looking for an elaborate reference text on digital library.