This grouped bar chart displays BMW sales volume by year from 2010 to 2024, with bars segmented by six global regions mapped to representative countries. The visualization uses D3 v7 with an SVG rendering, employing `d3.rollups` to aggregate data from a CSV file and `d3.scaleBand` for each year’s sub-groups. Hovering reveals a tooltip showing detailed metrics, while the color-coded legend distinguishes regions that are dimmed when deselected.