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Cryonic preservation is the process where ultra cold temperatures are used to preserve the body. The stated goal of the organizations that offer this service is to preserve the body until sometime in the future when it can be restored to good health due to medical advances.
Cryonics differs in that it is not considered a method of internment or a mortuary practice. For a body to be eligible for cryonics there must be a cardiac death without brain death. Someone who is declared brain dead is not a candidate for the process. Their goal is to preserve a brain that could be brought back to life.