This D3.js v4 bar chart displays the average attendance percentage for each module, with bars animated sequentially on load. Hovering over a bar highlights it in orange, increases its size, and reveals the exact percentage value above it; moving the mouse away restores the original appearance. The visualization loads data from `attend_data.csv`, uses an SVG canvas, and leverages D3 scales for the band and linear axes, along with transitions for the hover effects.