This interactive bubble chart visualizes the correlation between average horsepower, torque, and highway MPG across 31 car makes. Each circle represents a make, positioned by horsepower on the x-axis and torque on the y-axis, with bubble size encoding highway MPG and color distinguishing car brands via `d3.scaleOrdinal`. Hovering reveals a tooltip with the make name. The visualization uses SVG rendering with `d3.axisBottom`, `d3.axisLeft`, and `d3.scaleLinear` for scales, plus a custom legend for size and color. Data comes from the bundled `bubblechart.csv` file.