This interactive scatter plot visualizes the Iris dataset, displaying petal length against sepal width and encoding species by color. Users can hover over a species in the color legend to highlight corresponding data points while dimming others to 20% opacity. Built with React and D3 v5, the visualization uses `scaleLinear` for axes, `scaleOrdinal` for categorical coloring, and SVG circles for marks. The legend leverages mouse events to trigger state changes that filter the rendered data, creating a focused comparison between species groups.