Product Backlog

The Product Backlog is a Scrum artifact that represents all known future work needed to improve the product. It is an ordered, emergent list that evolves as the team learns more about the product and customer needs.
The Product Backlog includes everything from new features and enhancements to bug fixes, technical work, or experiments. It is not a static to-do list, but a living document that supports focused and adaptive product development.
The Product Owner is accountable for the Product Backlog's content, ordering, and transparency. However, it is created and maintained together with the Scrum Team, and it serves as the single source of work for everyone involved.
A well-managed backlog ensures that the team is always working on the most valuable items---and that the work supports the current Product Goal.