What is the difference between a power of attorney and an executor of estate in terms of their roles and responsibilities?

A power of attorney is a legal document that gives someone the authority to make decisions on behalf of another person while they are alive. An executor of an estate is responsible for managing and distributing a deceased person's assets according to their will. The main difference is that a power of attorney's authority ends upon the person's death, while an executor's responsibilities begin after the person has passed away.