This area chart visualizes revenue trends over time, with the x-axis representing years (based on customer counts) and the y-axis showing revenue in millions. The chart uses a skyblue filled area beneath the line to emphasize the magnitude of revenue values. Built with D3.js v7, the visualization fetches CSV data from a GitHub gist, processes it with `.csv()`, and renders the graphic using SVG. The code configures axes, labels, and margins, and uses `d3.area()` to generate the filled area path.