A Power of Attorney (POA) is a legal arrangement granting an agent authority to act on behalf of a principal in specific matters, such as medical or financial decisions. In Maryland, creating a valid POA requires adherence to several legal requirements, including the principal's capacity, witness signatures, notarization, clarity of terms, and compliance with the Maryland POA Act. This document must be written, witnessed, and notarized to ensure its enforceability and authenticity.