Ultraviolet rays, often referred to as UV rays, are a form of electromagnetic radiation that possess a higher energy level than visible light but lower than X-rays. Synonyms for these rays include UV radiation, ultraviolet light, and black light. These rays can penetrate the skin and cause sunburn, skin damage, and an increased risk of skin cancer. However, they also have beneficial effects such as Vitamin D synthesis in the body, killing bacteria and viruses, and helping to sterilize water. Understanding different synonyms for ultraviolet rays is important in research, medicine, and industries using UV light technology.