The name of the process by which water vapor turns into ice is called "deposition." This physical process occurs when water vapor transforms directly into solid ice without first becoming a liquid. Deposition typically happens under conditions of low temperature and high pressure, such as when frost forms on cold surfaces during winter. It is an essential aspect of the water cycle and contributes to the formation of snowflakes and ice crystals. Understanding deposition is crucial in fields like meteorology and climatology, as it affects weather patterns and conditions in colder regions.