A pie chart displays the 2015 sales for different companies, with each slice colored and labeled in a legend alongside its total value. The visualization uses D3 v5’s `pie` and `arc` functions to generate the SVG segments, with `scaleOrdinal` assigning colors from a fixed palette. Data is loaded asynchronously via `d3.csv` from a gist, and the chart is rendered within a React-based HTML page, with legend text and values formatted using `d3.format`.