A line chart displays bike sales over time, with the x-axis showing yearly dates and the y-axis measuring population as a proxy for sales volume. The visualization loads CSV data from a GitHub gist using `d3.csv`, then renders an SVG path generated with `d3.line` and scales from `scaleTime` and `scaleLinear`. Axes are drawn with `axisBottom` and `axisLeft`, including custom tick marks and labels, while CSS styles the orange stroke and red title.