This interactive scatter plot visualizes the Iris dataset, mapping petal length against sepal width with points colored by species. A React-driven color legend allows users to hover over species names, which highlights matching data points and fades all others using opacity transitions. Built with d3.scaleLinear for axes, d3.scaleOrdinal for categorical colors, and SVG circles rendered through React components, the visualization responds to hover events via useState and onMouseEnter handlers to filter and re-render marks dynamically.