This example presents an interactive scatter plot of the Iris dataset, mapping petal length and sepal width while coloring points by species. A color legend allows hovering over a species to highlight its corresponding points and fade the others. The visualization is built with React and D3 v5, using `d3.scaleLinear` for axes, `d3.scaleOrdinal` for colors, and SVG circles rendered by custom React components. Data is loaded asynchronously via `d3.csv` from a remote gist.