Pie charts are commonly used to display simple values. A Pie chart draws each series as a slice in a pie. Pie charts have one significant difference when compared to other C1Chart chart types: in Pie charts, each series represents one slice of the pie. Therefore, you will never have Pie charts with a single series (they would be just circles). In most cases, Pie charts have multiple series (one per slice) with a single data point in each series. C1PieChart represents series with multiple data points as multiple pies within the chart.