A donut chart built with React and D3 displays the full distribution of colors from a CSV dataset of color names. The visualization renders every row as a single pie slice, using `d3.pie()` to compute the angles and `d3.arc()` to generate the SVG paths. Data loading is handled inside a React `useEffect` hook with `d3.csv`, while a loading state shows "Loading..." before the chart appears. The example demonstrates integrating D3’s data manipulation with React’s component lifecycle.