This stacked bar chart displays categorical data across groups, with each bar divided into colored, labeled segments. Built with D3.js v3, it uses `d3.layout.stack()` to compute the stacked series and SVG `rect` elements to render the bars. The visualization includes axis scales via `d3.scale.ordinal` and `d3.scale.linear`, and interactive hover effects that reveal tooltips through `d3.select` and mouse event listeners. The data is structured as an array of series, and the chart updates dynamically based on user interaction. It demonstrates a reusable, forkable approach to ordinal bar charts with stacked layers.