A freeze dryer, also known as a lyophilizer, is a device used to preserve perishable materials by removing moisture through a process called lyophilization. This method involves freezing the material, then reducing the surrounding pressure and adding heat to allow the frozen water in the material to sublimate directly from the solid phase to the gas phase. Freeze dryers are commonly used in the food industry to extend the shelf life of products without compromising their nutritional value or taste. They are also utilized in pharmaceuticals to stabilize sensitive compounds and in scientific research for preserving biological samples. Home freeze dryers have become popular for individuals looking to preserve their own food, providing an effective way to store fruits, vegetables, meats, and even entire meals for long periods without the need for refrigeration.