A smoothed line and area chart visualizes supermarket sales in India over time, with the line marking yearly sales values and the orange area emphasizing the trend beneath the curve. The chart uses D3 v5 with SVG rendering, employing `scaleTime` and `scaleLinear` for the axes, `line` and `area` generators with `curveBasis` for smoothing, and `axisBottom` and `axisLeft` for gridlines. Sales data is parsed from a CSV file, formatted as years via `d3.timeParse`, and styled with custom CSS for axis labels and chart elements.