Cryotechniques refer to methods and technologies used to manipulate and preserve biological materials at extremely low temperatures, typically involving the use of liquid nitrogen or other cryogenic substances. These techniques are essential in fields like cryopreservation, where cells, tissues, and even whole organisms can be stored for long periods without damage. Cryotechniques also play a role in various scientific and medical applications, including the preservation of reproductive cells and the study of biological processes at low temperatures.