A PO Box is a secure, locked mailbox located at a post office. It allows individuals and businesses to receive mail and packages without using a home address. People often choose PO Boxes for privacy, security, or convenience, especially if they live in areas where mail delivery is unreliable. To rent a PO Box, you typically need to fill out an application and pay a rental fee, which can vary based on the size of the box and the rental period. PO Boxes are available in different sizes, accommodating various volumes of mail and packages.