This visualization displays supermarket sales in India over time, combining a smooth line chart with an area chart to emphasize sales trends. The chart uses D3 v5's `scaleTime` and `scaleLinear` for axes, with `line()` and `area()` generators using `curveBasis` for curved paths. Data is loaded via `csv()` from a GitHub gist, where each date is parsed with `timeParse("%Y")`. SVG rendering includes labeled axes, gridlines via tick sizes, and a bold dark line over an orange filled area.