This bubble chart visualizes vehicle performance by plotting horsepower on the x-axis and torque on the y-axis for 31 car makes, with bubble size encoding highway MPG and color distinguishing each brand from a CSV dataset. The visualization uses D3 v7 to create an SVG with linear scales, ordinal color mapping, and interactive tooltips that appear on mouseover with vehicle details. Hover effects trigger opacity and stroke changes, while separate size and color legends help interpret the third and fourth data dimensions encoded in the circles.