This example visualizes the Iris dataset as a scatter plot, mapping petal length to the x-axis and sepal width to the y-axis. Points are colored by species using a categorical color scale. The visualization is built with React and D3 v5, using `scaleLinear` for axes and `scaleOrdinal` for color mapping. SVG circles are rendered via a `Marks` component, with hover tooltips generated using native `<title>` elements. Data is loaded asynchronously from a CSV file using D3’s `csv` function.