This interactive scatter plot lets users explore the auto-mpg dataset by changing the x- and y-axis variables through dropdown menus. The visualization uses D3 v5 to render animated SVG circles that smoothly transition between selections, with scales, axes, and labels updating dynamically. The code implements custom `dropdownMenu` and `scatterPlot` modules, leveraging D3's `scaleLinear`, `extent`, and `axisBottom`/`axisLeft` APIs, along with `transition` for the animated circle movement.