Synopsis This book gives an introduction to the educational technology and gives an overview of audio visual aids that have been using in our classrooms. It gives a detailed description of television, video production and teleconferencing. The book provides a good coverage of computer, its importance in education and description of LCD projector which is new among audio visual aids. It also covers internet and its relevance in education, how to use internet in the classrooms, virtual reality, artificial intelligence and an outline of useful websites related to education. This book provides a framework to help students, teachers, prospective teachers and teacher educators and all others who are concerned with educational technology.