Freeze dryers, also known as lyophilizers, are critical for drying heat-sensitive biological products, such as vaccines, blood plasma, and other biologics. This technology uses a vacuum and low temperatures to remove water through sublimation, preserving the structural integrity and biological activity of the products. Freeze dryers are also used in the production of high-value pharmaceuticals, such as monoclonal antibodies, to enhance their stability and shelf life. They are particularly useful for products that require long-term storage and transport without refrigeration.