An Agile Product Owner is a key project stakeholder who represents the customer's interests. They are responsible for defining and prioritizing the product backlog, ensuring that the team is working on the most valuable features first. They communicate with stakeholders, gather requirements, and work closely with the development team to clarify details. They also accept or reject work results, making sure that the product meets the defined standards and customer needs. Their ultimate goal is to maximize the value of the product and the work of the development team, ensuring a smooth, efficient, and customer-focused development process.