Ultraviolet light is a segment of the electromagnetic spectrum characterized by wavelengths shorter than visible light but longer than X-rays. As an academic concept and research area, the study of ultraviolet light encompasses its generation from energetic sources (such as stellar processes and high-temperature plasmas), its unique physical and chemical properties including high photon energy and significant photochemical activity, and its complex interactions with matter across various states. Research in this domain is crucial for understanding phenomena in astrophysics, atmospheric science, photochemistry, materials science, and biology, as well as for developing applications in areas such as sterilization, spectroscopy, and industrial curing.