A bubble chart shows the correlation between average torque, horsepower, and highway MPG across car makes. Each circle’s position maps to horsepower and torque, while its radius encodes highway MPG and its color represents the car make. The chart uses D3 v7 with SVG rendering, including scales for position and size, a color ordinal scale, and interactive tooltips on mouseover. A legend displays both the MPG size scale and color-coded makes. Data loads from a local CSV file.