Synopsis Educational Technology is a branch of science that combines the study and interaction of education and technology. The complex relationship between education and technology has benefited the mankind, since prehistoric times. However, it was in the twentieth century and particularly its later half that Educational Technology witnessed a revolutionary change. Many a research were conducted and newer horizons reached during that period. The present publication cover all the topics needed by the students of Education, besides there are chapters of general interest but of great value to the students and teachers.