Long time PowerPoint users will remember the difficulties of charting — it was so painful, time-consuming, and repetitive a task changing the fills of all the series one after the other — and if your presentation had more than one chart slide, then you also had to ensure that all charts looked the same. PowerPoint 2007 and 2010 make this sort of repetitive formatting easy and consistent with the Chart Styles option.
Learn more about Chart Styles here.

