This stacked bar chart displays sales performance across five product categories—Electronics, Clothing, Books, Furniture, and Toys—for four regions (North, South, East, West), with percentages derived from the CSV dataset. The visualization uses D3.js v7 to render an SVG, employing d3.stack() to compute stacked series, d3.scaleOrdinal for category colors, and d3.scaleBand with d3.scaleLinear for axes. Interactive tooltips show exact category percentages on mouseover, while hover effects change bar opacity, and a legend identifies each category.