This example displays global internet usage percentages for countries such as Afghanistan, Australia, and China. It presents the data as a pie chart rendered with SVG, where hovering over a segment highlights it and displays a tooltip with the country name and value. The chart is built using D3 v4 pie and arc layouts, with mouseover and mousemove events managing the tooltip’s position and opacity. The data originates from a CSV file loaded via D3's csv function within a React framework.