Spectroscopy is a branch of science that deals with the study of the interaction between matter and electromagnetic radiation. This field involves the measurement and interpretation of the absorption, emission, or scattering of light by atoms and molecules. Spectroscopy is used in various scientific disciplines, including chemistry, physics, biology, astronomy, and materials science, to study the composition, structure, and properties of different substances. It provides valuable information about the energy levels, molecular structures, and chemical reactions of molecules, making it a powerful tool for research and analysis. Spectroscopic techniques include methods such as infrared spectroscopy, UV-visible spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, and mass spectrometry.