A scatter plot of the Iris dataset, with sepal width on the y-axis and petal length on the x-axis, colored by species. Hovering over a color legend item fades out points from other species and brightens the selected one. Built with React and D3 v5, it uses `d3.csv`, `scaleLinear`, and `scaleOrdinal`, with `onMouseEnter` and `onMouseOut` events for interactivity, and renders axes, legend, and marks as SVG elements.