The visualization presents BMW's global sales from 2018 to 2025 through four linked charts: annual revenue bars, year-over-year growth lines for revenue and units, a sunburst model-mix, and a portfolio-shift chart. It uses d3.v7's `scaleBand`, `scaleLinear`, `axisLeft`, `axisBottom`, and `line` APIs to render SVG graphics. Monthly CSV data is aggregated into yearly totals, showing revenue trends, growth correlations, and the growing share of electric models alongside dominant SUVs.