This bar chart displays the top 50 modules by student count, filterable by department (CSIS, CAM, or GAV). The visualization uses D3.js (v5) within a React framework to render the SVG, employing `scaleBand` for the y-axis and `scaleLinear` for the x-axis. Data is loaded from a CSV via d3 `csv`, nested and rolled up by module code to calculate counts. A dropdown menu, built with ReactDropdown, allows users to filter departments, dynamically updating the bars. Tooltips show exact counts via SVG `<title>` elements.