product such as requirements, features, bugs, estimation, etc. • Product Backlog Items (PBIs) are small items describing what to do specifically. • The Product Owner is responsible for the Product Backlog, while management can be delegated. • The Product Backlog has a hierarchical structure, with themes, epics, user stories, and tasks. • Good PBIs should be following the INVEST framework. • The 3C Model is a best practice for ensuring the quality of PBIs. • The Product Backlog is managed through Sprint Events.