This scatterplot visualizes the relationship between fuel efficiency (mpg) and vehicle weight for a dataset of cars. Each circle represents a car, with its position determined by its mpg and weight values. The visualization uses D3 v5 to load data from a CSV file and render SVG circles. It employs `d3.scaleLinear` for both axes, `d3.axisBottom` and `d3.axisLeft` for tick marks, and `d3.extent` to compute scale domains. Gridlines are created using negative tick sizes, and axis labels are rotated for clarity.