Quantum chemistry is the study of chemical properties of matter along with the application of theorems and methods derived from quantum mechanics. The field is relatively new and it concentrates on the states of the nucleus as well as the molecule; hence it is applied in computational chemistry and atomic physics. This textbook on quantum chemistry discusses the fundamental concepts in the most easy and comprehensive manner. The field is highly experimental and the topics included elucidate the various technology and devices that are used to study this field. Different approaches, evaluations and methodologies on quantum chemistry have been included in this book. The textbook aims to serve as a resource guide for students and facilitate the study of the subject.