This area chart displays the average car price per year, aggregated from a Cars.csv dataset. It uses D3 v7's `d3.csv` and `d3.rollup` to process the data, then renders an SVG area chart with `d3.area` and `d3.scaleLinear`. The chart includes axes, gridlines, and labeled axis titles, with interactive tooltips on data points showing the year, average price, and model count.