A Power of Attorney is a legal document where one person, called the Principal (probably you), gives legal rights to another person, called the Agent, to act on the Principal’s behalf on almost all financial matters. Financial decisions, not medical. So the Principal’s Agent could sign a lease renewal on behalf of the Principal, or sign insurance documents (change of beneficiary forms, for example), or sign checks and pay bills on behalf of the Principal . . . many, and most, types of financial matters. Some actions the Agent is not allowed to take under a Power of Attorney, such as voting, or getting into a divorce; those types of very personal matters. Otherwise, a Power of Attorney is one of the most important and powerful documents available under New York law.