Pie charts are usually used for representing the data which can be arranged in a row, with no zero or negative values and - what now is important - with a few points. There are some situations when there are a number of points with small values, but it’s necessary to show them in a pie. In this case, we can group those points in one – this will help us to understand the chart.
This chart tells about cosmetic sales, and there are some products which were less popular, so their values are significantly smaller. We grouped all values under 1000 and put all of them into one series. So, after grouping, we have 6 slices of a pie, each is a series and represents a cosmetic product – except one, which represents a number of products, which were less popular (nail polish, eyebrow pencil, eyeliner and eyeshadows). Each series is colored differently; the legend is on, so you can highlight and explode/unexplode the slices.