This scatter plot visualizes the Auto MPG dataset, showing relationships between car attributes like horsepower, weight, and acceleration. Two dropdown menus let users select which columns map to the x- and y-axes, with circles animating smoothly to their new positions via `transition().duration(1000).delay()`. The visualization is built with D3 v5, using `scaleLinear` and `extent` for scaling, `axisBottom` and `axisLeft` for axes, and custom reusable functions `dropdownMenu` and `scatterPlot` for modularity.