This visualization shows student retention outcomes grouped by course, comparing the number of retained students against those who dropped out for each academic program. The data comes from a CSV dataset with a "Target" column indicating dropout or graduation status. The implementation uses D3.js v7 with SVG rendering, employing `d3.rollups` to aggregate counts, `d3.scaleBand` for the grouped bar layout, and `d3.axisBottom` and `d3.axisLeft` to generate axes. Interactive tooltips appear on mouseover, highlighting individual bar values and highlighting the hovered bar with a color change.