Agricultural extension plays a crucial role in boosting agricultural productivity, increasing food security, improving rural livelihoods, and promoting agriculture as an engine of pro-poor economic growth. Extension provides a critical support service for rural producers meeting the new challenges confronting agriculture transformation in the global food and agricultural system, including the rise of supermarkets and the growing importance of standards, labels, and food safety growth in nonfarm rural employment and agribusiness. An agricultural extension service provides technical aid to farmers on any agricultural issues. It works to supply them with the essential inputs and services that support and increase their agricultural production. New ideas and techniques developed by the agricultural scientific research centers are dispersed among the farmers by the agricultural extension activities. The book has been written to serve as a textbook for comprehensive and will meet the growing need of agricultural extension of graduate and post graduate and post graduate students at university level of agriculture. Extension education is essential for agriculture development. Extension education help transformation of our rural India. Agricultural extension is an important and specialized branch of agriculture which associated with different aspects of technology transfer to the farmers.