This book is a complete guide to designing of Interactive Digital Learning System on the subject LIS. In the present-day scenario due to covid-19, the education sector is facing a lot of threats to continue the day-to-day teaching-learning process. All the academic institutions are closed for a long time throughout the world. Therefore, digital learning system can be a good alternative for the traditional educational institutions. It can offer live classroom experiences, 3-tire interactive sessions among the learners-instructors-administrator, learning resources based on 4-quadrant approaches, intelligent and interactive question-answer based examination system, interactive self and peer-assessment facilities, interactive survey, glossary and many more. Thus, the learning community can realize a real-life experience more or less similar to traditional classroom teaching. This book is a peer-reviewed publication and based on Ph.D. thesis of Dr. Md Ajimuddin Sk completed under the supervision of Dr. Sibsankar Jana. This book will be very much helpful for the researcher, guide, course creator, instructors those who want to design their online course in Digital Learning Environment.