This example visualizes car sales in India from 2009 to 2019 using a combined line and area chart rendered in SVG. The orange area chart highlights sales volume over time, while a black line traces the same data for clarity. It uses d3.csv to load data from a GitHub gist, d3.scaleTime and d3.scaleLinear for axes, and d3.line and d3.area with curveBasis to generate the smooth paths. Axis labels and gridlines are styled via CSS.