From the teaser:
Create flexible & powerful line, bar and pie charts. Over 14 options available to configure!
My take:
A great block that makes data display adorable!
Advanced Charts is an easy to configure way to display changeable data on your site as a graph. It supports Line, Bar and Pie.
More information at the c5 extras site: http://c5extras.com/add-ons/advanced-charts/