A freeze dryer, also known as a lyophilizer, is a device used to extend the shelf life of perishable items by removing water content through a process called sublimation. By removing water content, freeze dryers preserve food without affecting its shape, structure, or nutritional value. Freeze dried items have an extended shelf life at room temperature and can be rehydrated quickly when needed. This technology is used for everything from preserving fruits and vegetables for long-term storage to preparing medicine for easier transport and storage.