Spectroscopy is the scientific study of interactions between matter and electromagnetic radiation. Spectroscopy is classified according to the type of radiative energy involved like electromagnetic radiation, radiated pressure waves, particles that can be a source of radiative energy, like electrons and neutrons. The interaction between matter and energy can be put under the bracket of absorption, emission, elastic scattering, inelastic scattering, etc. Various other forms of spectroscopy include auger spectroscopy, correlation spectroscopy, Fourier transform spectroscopy and Hyperspectral imaging which are distinguished by their specific applications. The topics included in this book on spectroscopy are of the utmost significance and bound to provide incredible insights to readers. It aims to shed light on some of the unexplored aspects of this field and the recent researches in this field. This book strives to assist students and researchers with a goal of delving into the concepts and applications of spectroscopy.