A scatter plot visualizes the relationship between student age and exam marks across various university courses. Each point represents an average mark for a specific age group within a course, with the x-axis scaled linearly and the y-axis using a band scale for discrete age values. The visualization uses D3 v5's `scaleLinear`, `scaleBand`, `axisBottom`, and `axisLeft` to construct the SVG chart, with margins and formatting applied to the axes. Data comes from a CSV file containing department, course, age, attendance, and marks columns.