A pie chart displays the CSS named colors from a CSV file, with each color rendered as a slice filled with its corresponding RGB hex value. Using React for component state and lifecycle management, the example fetches data via `csv` from D3 v5, then computes the pie layout with `pie()` and draws the arcs with `arc()`. The chart is rendered as SVG within a React component, with the D3 `pie` function assigning equal values to each slice.