This textbook is written for undergraduate and postgraduate students of Extension Education at Home Science Colleges. It shall serve as a reference book for Extension students of Agriculture, Veterinary, Forestry, Fisheries and Basic Science at Universities, Colleges and Institutes. It shall as well serve as a handbook for Government Departments, Non-Government Organizations, Rural Banks and Cooperatives, Krishi Vigyan Kendra, etc. to support them in extension work. The meaning, process and evolution of extension and extension systems from India's pre independence era to the present era are described in this book as well as the different extension teaching methods and teaching aids used while extending information at villages. The book also comprehends the relationship between Home Science education and extension systems familiarizing with the structural and functional concepts of rural society. The concept, use, importance and limitations of each of the extension teaching methods are important to know for extension workers so that they can use them efficiently. However, these course contents are primarily meant for the use of student communities, teaching and research fraternities of Home Science, Agricultural and allied Sciences all over the globe in general and India in particular.