This line chart visualizes shampoo sales over a 15-year period, with the year on the x-axis and sales units on the y-axis. The chart is rendered as an SVG using D3 v5, employing `scaleTime` and `scaleLinear` for the axes and `line` to generate the path. Data is loaded from a CSV via GitHub Gist, and axis labels are added using `axisLeft` and `axisBottom`.