The Product Owner (PO) in the team is responsible for managing and prioritizing the Team Backlog, which is the single source of truth for the upcoming features of the system1. The PO works with the Product Manager, who owns the Vision and the Roadmap, to define and sequence the features in the Program Backlog2. The PO also collaborates with other POs in the Agile Release Train (ART) to manage dependencies and ensure alignment across teams3. The PO maintains and prioritizes the Team Backlog, which contains user stories, enablers, and other backlog items that the team needs to implement to deliver value to the customer4. The PO also participates in the backlog refinement sessions, where the team defines, discusses, estimates, and establishes acceptance criteria for the backlog items. References: Team Backlog - Scaled Agile Framework, Product Owner - Scaled Agile Framework, Program Backlog - Scaled Agile Framework, Story - Scaled Agile Framework, [Backlog Refinement - Scaled Agile Framework]