A pie chart displays the colors from the CSS color names dataset, with each slice representing a color category. The chart is rendered as an SVG using React and D3, where the `d3.pie` function computes the arc angles and `d3.arc` constructs the path for each slice. The data is loaded asynchronously from a CSV file via `d3.csv`. The code maps each data row to a pie slice, filling it with the corresponding hex value from the dataset.