This interactive stacked bar chart visualizes sales by sub-category and customer segment, using animated transitions and hover effects to highlight individual segments. Built with D3.js, it employs `d3.layout.stack` for stacking, `d3.svg.axis` for scales, and `d3-tip` for tooltips showing sales values. A color legend allows users to filter and emphasize specific segments, while the base bars fade to provide focus. The visualization reads from static CSV data and renders in SVG.