Snow is a crystaline form of solid water or ice, consisting of a multitude of snow flakes. Since snow is a composite of innumerable discrete entities, each of which is unevenly formed, it is an open structure which makes it soft, unless packed together by external pressure. Snow is commonly formed as water vapor concenses at high altitude in the atmosphere and subsequently falls to the surface of the earth.
Snow is a prerequisite for many of the winter sports and much beloved by children. In regions where snow is scarce but temperature low enough, snow cannons may be utilized to produce an adequate amount for sporting purposes.
Snow may be used as a construction material, and is the primary component in for example igloos.