Final answer:
A living will is a legal document detailing an individual's medical treatment preferences for end-of-life care, including instructions for a DNR order or the appointment of a health care proxy.
Step-by-step explanation:
A document stating a person's wishes regarding the medical circumstances under which his or her life should be terminated is known as a living will. A living will is a form of advance directive that details specific interventions a person wishes to receive or avoid in end-of-life situations. These may include instructions for a Do Not Resuscitate (DNR) order, or the naming of a health care proxy, who is an individual designated to make medical decisions on the patient's behalf if the patient is no longer able to communicate their wishes.