In view of the importance of polymers and plastics and considering that polymers are known as one of the most important materials, Dr. Abdul Kalam Technical University (formerly known as UP Technical University) has introduced a course on Polymer Science and Technology. Although, there are large number of books which describe both basic and applied aspects of polymers, but we feel that there is no single book which covers the entire contents of the above course. This book written in a very simple language has now been revised and several important topics such as Living Polymerization, Ring Opening Polymerization, Group Transfer Polymerization, Polymer Nomenclature, Degradation of Polymers, Biodegradable Polymers, Conducting Polymers, Light Emitting Polymers etc. have been included in it.