Basically, a power of attorney is a document that appoints someone to make financial or medical decisions on behalf of someone else, especially if they’re unable to make their own decisions. This document also provides specific instructions about what someone wants for medical care or financial management. Generally, the person appointed is called the agent. Many people of older age will appoint a trusted friend or family member as their agent so that they can receive care that they desire, especially when they’re too physically or mentally ill to do so.