Burndown Charts
Burndown charts show work remaining over time. Work remaining is the Y (vertical) axis and time is the X (horizontal) axis. The work remaining should go up and down and eventually trend downward. These are some types of burndown charts.

This is an example burndown chart.

Example burndown chart

A Sprint Burndown Chart shows daily progress.  A Release Burndown Chart shows progress towards the planned work for a release.  A Product Burndown Chart displays progress relative to the entire product backlog.

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