Definition of a Product Backlog Item
A Product Backlog Item in Scrum is simply a description of a piece of work that the Scrum Team intends to undertake in the future. It is abbreviated as PBI.
It can be anything, such as building a new feature, fixing a problem, modifying existing components or improving something in the product.
All PBIs are listed on a list called the Product Backlog. The items at the top of the backlog are detailed and refined enough to be completed within one Sprint. You may also say that “these backlog items are ready for selection in the Sprint Planning“. Refining the Product Backlog is also known as refinement.
The Product Owner is responsible for effective Product Backlog management and maximizing the value of the product.