Cryonics is the practice of preserving individuals who have died from what is currently considered an incurable condition, with the hope that future medical advancements may allow for revival and treatment. This process involves cooling the body to very low temperatures to prevent cell damage, typically using liquid nitrogen. The concept of cryonics is based on the idea that death is not necessarily permanent and that future technology could potentially restore life. While it is a controversial field, some people choose to undergo cryopreservation in hopes of a future where diseases like cancer or heart disease can be cured.