This area chart visualizes the sales of cars in India from 2009 to 2019, using a smooth, curved line and a filled region beneath it to emphasize the trend. The visualization is created with D3 v5, parsing CSV data from a GitHub Gist. The code employs `select`, `scaleTime`, `scaleLinear`, and the `axisBottom` and `axisLeft` helpers to build the chart, while `area` and `line` generators, configured with `curveBasis`, define the filled area and the line path, respectively.