Quantum mechanics is the branch of physics that studies the behavior of matter and light at the atomic and subatomic scales. It aims to explain the properties of molecules and atoms, and their constituents that include electrons, protons, neutrons and other esoteric particles such as quarks and gluons. Quantum mechanics presents that light and other forms of electromagnetic radiation are available in discrete units known as photons. It predicts the spectral energy of photons and the intensities of its light beams. This book provides comprehensive insights into the field of quantum mechanics. It aims to shed light on some of its unexplored aspects and the recent researches in this field. The book is an essential guide for both academicians and those who wish to pursue higher research and studies in quantum mechanics.