This screen the details of sprint.

A burn down chart is a graphical representation of work left to do versus time. The outstanding work (or backlog) is often on the vertical axis, with time along the horizontal. That is, it is a run chart of outstanding work. It is useful for predicting when all of the work will be completed. The hour burndown chart provides you with the following information: Actual Hours -- The number of hours remaining until the version release date. Planned Hours -- The minus of the previous planned hours and the current actual hours. Ideal Hours -- The ideal burndown. This is computed with the remaining estimates, not the original estimates of the hours remaining at the version's start date. Daily Completed -- The total time worked by the team (the current actual hours).