Freeze drying can be understood as an approach employed by pharmaceutical manufacturers to infer dry products from hydrous solutions. Initially discovered in around the 1940s, the approach extracts a dry product which can be facilely restored to its initial form by adding water when needed. In the pharmaceutical sector, freeze-drying, also known as lyophilization, as it is precisely pertained to, is utilized on cells and tissues, vaccines, hormones, and other products. The technique enables these products to be conserved and maintained before they are used or tested.