This pie chart visualizes year-to-date car sales across multiple brands, displaying each brand’s proportional share and a corresponding legend with sales totals. The chart uses D3 v5 APIs including `d3.pie`, `d3.arc`, and `d3.scaleOrdinal` to generate SVG paths and text labels positioned via `arc.centroid`. Data is loaded asynchronously from a CSV file using `d3.csv`, with values parsed and aggregated before rendering. The example demonstrates standard D3 data-binding patterns for entering paths and legend elements.