What is spectroscopy and what is it used to analyze?

Spectroscopy is a technique used to study the interaction between matter and electromagnetic radiation. It involves the measurement of how light is absorbed or emitted by a substance at different wavelengths. Spectroscopy is used to analyze the chemical composition, structure, and properties of materials. It can provide information about the molecular composition, energy levels, and electronic structure of a sample. This technique is widely used in various scientific fields such as chemistry, physics, biology, astronomy, and environmental science.