A Medical Power of Attorney is a legal document that allows an individual, known as the principal, to appoint someone else, called the agent, to make healthcare decisions on their behalf. This is particularly important if the principal becomes unable to communicate their wishes due to illness or injury. The agent's responsibilities include discussing treatment options, consenting to or refusing medical procedures, and ensuring that the principal's healthcare preferences are respected. It is essential for the principal to choose someone they trust, as this person will have significant authority over their medical care in critical situations.