The Sprint Backlog is a detailed plan for the Sprint, including the Sprint Goal, selected Product Backlog items, and the plan for delivering them. It serves as a roadmap for the work to be done during the Sprint.
Not all tasks in the Sprint Backlog need to contribute directly to the Sprint Goal. The Sprint Backlog does not have to be perfect or complete by the end of Sprint Planning; the minimum requirement is a Sprint Goal and enough planned work to start the Sprint.
