This pie chart depicts the distribution of car models by brand, aggregated from a CSV file of individual car records. The visualization uses D3 v5 to generate SVG arcs, with an interactive tooltip revealing each brand's model count and percentage on hover. A legend displaying brand names, color swatches, and formatted model counts accompanies the chart, and the code explicitly uses `d3.pie`, `d3.arc`, `scaleOrdinal`, and `schemeCategory10` for rendering and color assignment.