This example visualizes monthly insurance product sales in dollars over the year 2021 as a filled area chart. The chart uses D3 v4’s time scale for dates and a linear scale for sales values, drawing an SVG area path with a fill color. The data loads from a remote CSV file, with dates parsed via `d3.timeParse` and the area path constructed using `d3.area`. Axes and text labels for the x and y dimensions are added via `d3.axisBottom` and `d3.axisLeft`.