A donut chart visualizes the distribution of CSS named colors, with each color represented as a wedge in the SVG. The React app loads the data using D3’s `csv` utility, then maps each row to a path element with a fill matching the color’s hex value. D3’s `arc` generator computes the wedge shapes based on evenly divided angles, while React’s `useState` and `useEffect` handle asynchronous data fetching. The visualization demonstrates React’s declarative rendering combined with D3’s geometric utilities for scalable SVG output.