Online learning also known as e-learning is a type of distance learning which uses multimedia to access education outside physical classrooms. This type of learning is offered over the internet using digital technologies in order to support learning. The content is delivered online, using the internet. E-learning happens in a virtual environment which allows the participants to communicate with the teachers. This field uses cognitive, behavioural, emotional and contextual perspectives to design various e-learning programs. The software applications used for administration, tracking, documentation, reporting, and delivery of training programs and courses are known as learning management systems. Some of the major advantages of online learning are enhanced participation, increased interaction between students and teachers and ease of convenience. This book is a valuable compilation of topics, ranging from the basic to the most complex advancements in this field. It studies, analyses and upholds the pillars of online learning and its utmost significance in modern times. With state-of-the-art inputs by acclaimed experts of this field, this book targets both students as well as professionals.