In this book, I have tried to identify the overview of classical mechanics; understand the failure of classical mechanics and develop new ideas of quantum mechanics. Moreover, the module has been developed from postulates, principles, and sufficient details of mathematical calculations and graphs have been given to help the reader understand and appreciate the subject without requiring guidance of experts. The research literature, research techniques, results discussed in detailed in every chapters. Furthermore, at the end of each chapter, they are a number of unit summary, unit exercises and references have been provided to help the reader realize the subject developed and master it. The module studies provide a wealth of information from the failure of classical mechanics to the development of quantum mechanics.