Synopsis Educational technology is a new concept in education which has emerged in the 20 century and revolutionized educational thinking and practice. This compilation presents a comprehensive introduction to educational technology. It traces the roots of educational technology and shows how it has developed into a modern concept. A review or early literature has been presented. How educational objectives can be analysed and pursued, how theories of teaching and learning can be put to optimal use in the classroom, how classroom interaction can be analysed, and how audio-visual aids, including computers, can be effectively used in class teaching all these important aspects have been authoritatively dealt with by experts in educational technology. This book will serve as a highly informative and useful reference book for the teachers, students and researchers in educational technology.