A stacked bar chart visualizes regional sales across three product categories, with each bar showing total value per region and segments colored by category. The visualization loads data from a CSV file and renders SVG graphics using D3 v7, employing `d3.csv` for data parsing, `d3.scaleBand` and `d3.scaleLinear` for positioning, and `d3.stack` to compute stacked series. Axes are generated with `d3.axisBottom` and `d3.axisLeft`, while regions are ordered alphabetically on the vertical axis.