This example presents a pie chart visualizing low-income reading scores across U.S. states, with each slice’s size and color representing a state’s value. The chart uses D3 v5 to fetch CSV data from a GitHub gist, then applies `d3.pie` and `d3.arc` to generate and position the slices, while `scaleOrdinal` assigns categorical colors. A legend with colored rectangles and formatted numbers accompanies the SVG rendering, and slice labels are placed using arc centroid calculations.