This stacked bar chart visualizes monthly sales data for ten products, with each bar segmented by month. The example uses D3.js v7 to generate random data, render SVG rectangles for the bars, and apply `d3.scaleBand` and `d3.scaleLinear` for positioning. Color encoding via `d3.scaleOrdinal` with `d3.schemeCategory10` distinguishes months, while axes, labels, and a legend are added using `d3.axisBottom` and `d3.axisLeft`.