The purpose of these book is to make easy understanding of science education. This book includes some basics of science education and hope that it is relevant to students, teachers and researchers in science education. The descriptions given here would enable the beginners to grasp the essential concepts in science education easily. It is hoped that this book would be equally helpful to the prospective teachers of teacher education institutes and teachers of in service. The book will also help teacher-educators to update their knowledge and to deal with context based understanding and analysis of their classroom experiences. Every effort has been carefully made to write the entries in a clear and lucid style to provide both straight forward definitions invaluable background information.