This example visualizes car sales in India from 2009 to 2019 using a combined line and area chart. The line shows sales trends over time, while the filled area beneath it emphasizes the magnitude of sales. It uses d3.scaleTime and d3.scaleLinear to map the data, along with d3.line and d3.area generators with a curveBasis smoothing. Data is loaded as CSV and formatted with d3.timeParse, rendered as SVG with axes labeled “Year” and “Sales.”