The book covers all possible information regarding extension education which is need for under graduate, post graduate and research student of Agricultural universities, Home science college, traditional universities, KVKs, Non-government organisations and persons working in the process of social development. New terminology as per latest UGC and ICAR syllabus has been incorporated. The focus through this book is not to replicate already available reading material but to clarify certain basic doubts and confusions relating to terms of extension education. The book addresses the concern of students and teachers. For the students the book will be a dictionary which could serve a handy tool for NET, ARS examination. Thus this book is in one go investment with long lasting use.