This stacked bar chart shows the distribution of average grades achieved across many module codes, segmented by grade bands from F to A. It is rendered as an animated SVG using D3.js version 3.5.6, with data loaded from a CSV file. The visualization uses `d3.layout.stack` with an expand offset to display proportions, and allows transitions between percentage and count views via radio buttons, though the buttons are commented out. Hovering highlights individual segments through CSS opacity changes.