This interactive BMW sales dashboard uses a tabbed interface to switch between an animated bubble chart of annual sales trends (2010–2024), a bar chart of total sales by model, a map with proportional bubbles for regional distribution, and a stacked bar chart classifying high versus low sales volume by region. The annual chart employs `d3.scaleSqrt` for bubble sizing, `d3.rollups` for data aggregation, and `d3.scaleBand` for model legends, with checkbox filters and play/pause controls. The other charts use `d3.rollups`, `d3.scaleBand`, `d3.scaleLinear`, and `d3.geoMercator` projection with `d3.geoPath`. All tooltips and bars rely on declarative `join` operations, sourcing data from a CSV.