Cryopreservation is the process of preserving biological material at very low temperatures, typically below -130°C. This method is commonly used for preserving cells, tissues, and organs for extended periods of time, as it helps to maintain the viability and functionality of these biological samples. Cryopreservation involves the use of cryoprotectants, such as glycerol or dimethyl sulfoxide, which help to prevent ice crystal formation and cell damage during freezing and thawing. The frozen samples are then stored in liquid nitrogen or other cryogenic storage units until needed. This technology has a wide range of applications in areas such as medicine, biotechnology, and research, and has revolutionized fields such as assisted reproductive technology, tissue engineering, and stem cell research. Cryopreservation allows for long-term storage of biological samples, making it possible to study and utilize these materials well into the future.