This visualization displays the number of students enrolled in the top 50 university modules, ranked by student count. A dropdown menu filters the bar chart by department (CSIS, CAM, GAV). The chart uses React with D3 v5 scales (`d3.scaleBand` for categories, `d3.scaleLinear` for values), data nesting via `d3.nest`, and renders SVG bars with tooltips showing exact counts. Data is loaded asynchronously from a remote CSV file using `d3.csv`.