This book is intended for both the undergraduate and postgraduate levels. The subject material deals with symmetry, starting from the basic and rudimental foundations of the concept and the depth of its applications. The presentation of the concepts and the related illustrations in the book are on semi-pedagogical lines and thus offer easy understanding to the reader. The book is designed with twelve well thought chapters, with each preceding chapter opening the gate for the development of the next thereby having a high degree of sequence.The first seven chapters are devoted to the indepth understanding of 'symmetry and group theory' of molecules and the last five chapters are developed on the aspects of how these formalisms are utilized for the 'structure, spectra and bonding' of molecules. The book also covers the essential basics of the group theory that are required for all sections of chemistry, and emphasizes the necessity of this theory to understand the theoretical and applied aspects of molecular spectroscopy. This text is the result of a long felt need for developing certain novel techniques for the teaching of this course. A 'Window-vision' has been provided in the book while presenting most of the chapters and 'Study Questions' are placed at the end of each chapter to help ensure understanding of the concepts. 'No more nightmares of group theory and spectroscopy' - is the ultimate purpose of this book.