This visualization displays average marks for individual university modules using a bar chart. Each module is represented by a vertical bar, with its height corresponding to the module’s average mark, and the bars are colored green by default. When the user hovers over a bar, it changes to pink, highlighting the selected module. The chart uses D3.js v4 to bind the dataset and render SVG rectangles, with the data coming from a JSON array containing module codes, marks, and student counts.