A power of attorney(POA) is a document giving someone permission to do something for someone else. It gives another person the legal authority to act on your behalf.
To understand a power of attorney, it is necessary to know a few terms:
"Agent" is the person who is given authority by a power of attorney.
"Attorney-at-law" is a person who is licensed to practice law before state or federal courts. This term has no relationship to a power of attorney.
"Attorney-in-fact" is the person who is given authority by a power of attorney. This is another term for "agent", and is used in many statutes. An attorney-in-fact does not have the power to represent anyone in court or to give legal advice.
"Durable Power of Attorney" is a power of attorney which continues after the principal becomes incapacitated, although not after the principal dies.