This D3.js example visualizes 2022 US auto sales by brand as a pie chart, displaying each brand's market share as a percentage and total sales in thousands. The chart uses D3's `pie` function to compute arc segments, `arc` to render the paths, and `scaleOrdinal` to assign a custom color palette. The visualization is drawn as SVG, with a legend showing brand names, market share percentages, and sales volumes. The data is loaded from a CSV file hosted on GitHub Gist using D3's `csv` method.