This interactive scatter plot visualizes the Iris dataset, plotting petal length against sepal width for three species. A color legend allows users to hover over species names, dimming all other points to highlight the selected group. The visualization uses React with d3.scaleLinear for axes, d3.scaleOrdinal for categorical colors, and d3.csv for data loading. SVG circles render the marks, while mouse events on the legend trigger state changes that adjust opacity via the fadeOpacity prop.