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Product backlog
The product backlog is a high-level document for the entire project. It contains broad descriptions of all required features, wish-list items, etc. It is the "What" that will be built. It is open and editable by anyone. It contains rough estimates, usually in days. This estimate helps the Product Owner to gauge the timeline and, to a limited extent, priority (e.g. if "add spellcheck" feature is estimated at 3 days vs 3 months, that may affect the Product Owner's desire).
Sprint backlog
The sprint backlog is a greatly detailed document containing information about how the team is going to implement the requirements for the upcoming sprint. Tasks are broken down into hours with no task being more than 16 hours. If a task is greater than 16 hours, it should be broken down further. Tasks on the sprint backlog are never assigned, rather tasks are signed-up for by the team members as they like.
Burn down
Publicly displayed chart showing effort remaining for the current sprint.
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