This interactive bar chart shows the enrollment numbers for various courses across 12 modules, with each bar color-coded by module code. Hovering over a bar displays a tooltip with the specific module, course, and enrollment count. The visualization uses a stacked bar layout implemented with D3.js, including `d3.layout.stack`, `d3.svg.axis`, and `d3.legend`, with data loaded from a CSV file. Animated transitions and hover-based highlighting of individual module series are supported through D3's data join and event handling.