This bubble chart visualizes the correlation between units sold, average price, and customer satisfaction for various iPhone models. Using D3 v7, the chart renders SVG circles positioned by linear scales for price and units sold, with radius encoding customer satisfaction ratings. Colors map to individual models via an ordinal scale using `d3.interpolateTurbo`. Interactive tooltips appear on mouseover, and legend circles show size reference points. Data is loaded from a CSV file containing model specifications and performance metrics.