Cryogenic freezers are specialized devices designed to store materials at extremely low temperatures, typically below -150 degrees Celsius. They use liquid nitrogen or helium to achieve these temperatures, which helps preserve biological samples, such as cells and tissues, for research and medical purposes. This technology is crucial in fields like biotechnology and cryobiology. These freezers maintain a stable environment to prevent ice crystal formation, which can damage cells. They are commonly used in laboratories, hospitals, and fertility clinics to store sperm, eggs, and other sensitive materials. Proper use of cryogenic freezers ensures the longevity and viability of these samples for future use.