Burndown chart

Remaining work can be represented in terms of either time or story points (a sort of arbitrary unit).

[3] Velocity is a measure that represents the productivity rate, within a predefined interval, for which deliverables are created, validated and approved.

This means that if a team constantly overestimates time requirements, the progress will always appear ahead of schedule.

Another difference is that burnup charts usually have a line representing total work.

[5] Similarly to burndown charts, the work can be measured in several ways, for instance, using time or story points.