This interactive scatter plot from the D3 example gallery uses two dropdown menus to let the viewer choose which data columns from the auto-mpg CSV dataset appear on the x- and y-axes. The visualization is rendered as an SVG, with circles animating into place over two seconds via D3's `.transition()` method. The code leverages the `d3.scaleLinear` and `d3.extent` functions to compute scales, and `d3.axisBottom` and `d3.axisLeft` to draw the axes with tick marks.