This stacked bar chart displays monthly sales data for two products across five months, with each bar segmented to show the relative contribution of product1 and product2. The visualization uses D3.js v7's `d3.stack()` to compute the stacked series and `d3.scaleBand` for the categorical x-axis. Bars are rendered as SVG rectangles with hover opacity changes, while `d3.axisBottom` and `d3.axisLeft` generate the month and sales axes. The dataset is hardcoded as an array of objects in the script.