The book presents a coherent and in-depth treatment of all the important topics on nuclear physics with up-to-date notions and viewpoints. It starts with the discussion on general properties of nucleus, and then moves on to give insights into nuclear models, radioactivity and its applications, nuclear force and nuclear reactions. Readers are also introduced with the concept of interaction of radiation with matter, and detectors including particle accelerators from a practical rather a theoretical point of view. A separate chapter has been devoted to particle physics along with the latest developments. The book also presents an overview of the applications of nuclear physics to various fields such as nuclear energy, healthcare, industry and environment. The evolution of the universe along with the primordial and the stellar nucleosynthesis has been discussed in the last chapter. The book is designed as a standard text for the undergraduate and postgraduate students of Physics.