For example, this chart from a study on data sources used for COVID data visualisation shows hundreds of categories in one pie. A pie chart with dozens of categories.

Pie charts also work well for displaying discrete data, as all the values combined equal 100 percent of the total. Because of this, pie charts are also a good way to display your values as ...

Pie charts and bar graphs may look like something out of 3rd grade math, but for business users, going from raw data to a chart that’s both useful and good looking is more complicated.

The best type of chart for proportional data is usually a pie chart. Pie charts work well when there are small numbers of proportions or categories, as too many make the pie chart look overcrowded ...

For example, below is a pie chart showing the support rate of Australia's major political parties, the Labor Party, and the Conservative Coalition of the Liberal Party and the National Party.