Exoplanet spectroscopy is the study of the spectra of extrasolar planets, or exoplanets, which are planets outside of our solar system. By analyzing the light emitted or absorbed by these planets, researchers can gain insight into their atmospheric compositions, temperatures, and other physical properties. Spectroscopy allows scientists to detect molecules such as water, methane, carbon dioxide, and oxygen in exoplanet atmospheres, which can provide valuable information about their potential habitability and conditions for life. This field is rapidly growing with advancements in observational techniques and instrumentation, opening up new possibilities for understanding the diversity of exoplanetary systems in our galaxy and beyond.