A spectroscopic survey is a method used in astronomy to study the properties of celestial objects by analyzing their spectral characteristics. This involves splitting light from the object into its component wavelengths, which can provide information about the object's temperature, chemical composition, and motion. Spectroscopic surveys are typically done on large scales, covering many objects in a given region of the sky to create a comprehensive dataset for analysis. These surveys can provide valuable insights into the formation, evolution, and dynamics of galaxies, stars, and other astronomical objects.