This book primarily focuses on the structuring and composition of polyesters. Polyesters are being broadly applied in distinct fields because of their extraordinary characteristics. This book encompasses important aspects like characterization, applications and synthesis of polyester. Biological and chemical techniques for the synthesis of polyester are one of the most significant topics of research that have been added in this book. Physical, mechanical and chemical characterizations as well as enhancement of polyester have also been discussed in this book. Few aspects of applications of polyester in coating of aluminum alloys employed in aircraft, immobilization of radioactive wastes, formation of the novel composites and fabrics manufacturing have also been discussed, emphasizing on the extensive possibilities of its implementations. The aim of this book is to serve as a good source of reference for researchers, students and scientists as well as for other veterans, both in industry and academia.