This image shows a pie chart three times with three selection effects. The largest segment (with 31.07% of the share) is selected.

In the first instance, the effect is highlight and the slice has a border. The border is created with a black outline outside a white outline to give the effect of a highlight.

In the second instance, the effect is explode and the slice is visibly separated from the rest of the chart.

In the third instance, the effect is highlight with explode, where both the above effects are combined.