Product Management is the role that ensures that the Agile Release Train (ART) has the Vision and Backlog needed to engage in PI Planning successfully. Product Management is responsible for defining and communicating the Vision, which describes the future state of the solution and its features1. Product Management also develops and maintains the Program Backlog, which contains the features and enablers that the ART will implement in the upcoming Program Increments (PIs)2. Product Management collaborates with stakeholders, customers, architects, and other roles to discover, prioritize, and refine the backlog items and present them to the ART during PI Planning3.
References:
*Vision - Scaled Agile Framework
*Product Management - Scaled Agile Framework
*PI Planning - Scaled Agile Framework