A pie chart widget graphically displays the values or counts of one of more attributes for a feature as proportions of a pie.
When displaying attribute values as segments in a pie chart, a summary operation is performed on the field values. The aggregate can be any one of the following:
In an emergency management scenario, you could configure a pie chart to display the counts of different types of police vehicles that are actively responding to incidents. There are currently twelve active police cars in this operation view. From the chart, you can see that four of them (33.3 percent) are patrol cars.