The book "Textbook on Fundamental of Extension Education" has certainly been a selection by the time itself, not by the choice of the author. The book has accommodated all possible innovative aspects of the basic concept of extension education with its rural developmental aspects followed by different rural-social, communication and entrepreneurial aspects of classical contents. The book has been written for the entry level of UG students in full compliance to the basic Extension Educational aspects as per ICAR 5th Dean Committee recommended Under Graduate syllabus, as delineated by the ICAR, New Delhi. The characterization being. The present book is spread over in five chapters, which covers fundamental of extension education, rural development, rural sociology and educational psychology, communication skills and personality development and entrepreneurship development and business management. I hope the book will be welcome by a galaxy of scholars and professionals and keep generating valuable feedback in reconstructing it in due course of time.