This interactive bar chart displays the number of students per module code across three departments, with a dropdown menu to filter by CSIS, CAM, or GAV. The visualization uses React with D3 v5's `scaleBand` and `scaleLinear` to render SVG rectangles, sorting modules by student count and showing the top 50. Data is loaded via `d3.csv` from a GitHub-hosted dataset, with nested rollup aggregation counting student records per module.