This interactive bubble chart visualizes vehicle performance characteristics across 31 automotive brands, plotting horsepower on the x-axis, torque on the y-axis, and highway MPG encoded by bubble size. Each brand's bubbles are color-coded using d3.scaleOrdinal with the Tableau10 color scheme, with hover tooltips displaying exact values. Built with d3.v7, the visualization loads data from a local CSV file via d3.csv and uses d3.scaleLinear for all three encoding dimensions, rendered as SVG with axis labels, legend, and smooth hover transitions.