This visualization displays shampoo sales over 15 years as an area and line chart, with time on the x-axis and sales values on the y-axis. The code uses D3 v5’s `scaleTime`, `scaleLinear`, `line`, and `area` generators with `curveBasis` to create smooth, filled curves. Data is loaded from a CSV file via `csv()`, and axes are rendered using `axisBottom` and `axisLeft`. The SVG chart includes labeled tick marks and axis titles, with the sales data parsed as numbers and dates converted to JavaScript `Date` objects.