This bar chart displays the average math scores for students grouped by department, computed from a CSV file using D3's `d3.csv` and `d3.group` methods. The visualization uses `d3.scaleBand` for the categorical x-axis and `d3.scaleLinear` for the continuous y-axis, rendering bars as SVG rectangles with a hover effect that changes their fill color. Axes are generated with `d3.axisBottom` and `d3.axisLeft`, and labels are added to clarify the department and score metrics.