Which item serves as a source of requirements for any changes to be made to the product?

The Product Backlog serves as a critical source of requirements for any changes to be made to the product. It is a dynamic list that contains all of the features, functionalities, enhancements, and bug fixes that are known to be required for the product's development. As it is continuously updated and prioritized, it reflects the evolving needs and priorities of the stakeholders and the team.

When the team identifies a need for changes—whether due to new requirements, market shifts, or feedback from customers—they would typically add or adjust items in the Product Backlog. This backlog is instrumental in guiding what will be developed in upcoming Sprints, ensuring that the most valuable and relevant changes are addressed first.

The Sprint Goal, while important for maintaining focus during a Sprint, does not serve as a standalone source of requirements but rather as an objective for the team's work within that specific iteration. The Increment is the actual product that results from completing work in a Sprint, representing what has been achieved but not serving as a source of requirements itself. The Definition of Done is a shared understanding of what it means for work to be complete, ensuring quality and consistency, but it doesn’t specify the requirements or changes needed for the product.

Therefore, the Product Backlog is essential in providing