The authors of this book seem to have embarked on this stupendous endeavour to disseminate what they know about online learning, its various modes and development of online courses. Online training and online tutoring are also well covered in this book. There is a special focus on online learning platforms also. This book provides an exhaustive list of apps for online learning. The effect of COVID - 19 pandemic on the growth and development of online learning is also delineated in detail. This book deals with the pros and cons of working online. Finally, this book boasts a wide range of research works done upto date on online learning and they are presented under various appropriate subheadings. This will be extremely useful for the professionals and the advanced learners who are interested in further search and research. This book will, no doubt, provide the present as well as the coming generations of teachers with an indepth insight into the applications and implications of online learning at present.