A horizontal bar chart displays revenue per month for twelve products from a supermarket dataset, loaded via `d3.csv` from a GitHub Gist. React state and hooks manage the asynchronous data loading, while D3’s `scaleBand` and `scaleLinear` map product categories and revenue values to SVG rectangles. Axes and gridlines are manually rendered with D3’s `ticks` and positioned using SVG transforms, with React generating the markup for each element.