The Product Owner (PO) is a member of the Agile Team responsible for defining Stories and prioritizing the Team Backlog to streamline the execution of program priorities while maintaining the conceptual and technical integrity of the Features or components for the team. © Scaled Agile, Inc.
A product owner is the central point of contact for a product. It is their job to know the customer inside and out and to work with the sales and marketing teams collectively to launch a product.