A pie chart visualizes 2022 US auto sales by brand, displaying each brand’s market share as a percentage and raw sales in thousands. The chart renders as an SVG using D3 v5, loading CSV data from a GitHub Gist via `d3.csv`. The code employs `d3.pie()` to compute arc angles, `d3.arc()` for segment paths, and `d3.scaleOrdinal` for categorical colors. Legends show brand names, percentage, and sales values, formatted with `d3.format`, while interactions are minimal, focusing solely on static data presentation.