This example shows a scatter plot of the classic Iris dataset, displaying sepal length on the x-axis and sepal width on the y-axis for 150 individual flowers. The visualization is built using React's `useRef` and `useEffect` hooks to manage the SVG element and coordinate the loading of CSV data via D3's `csv` function, after which the `viz` function from `viz.js` renders the chart. The rendering relies on D3 v7 utilities including `scaleLinear`, `extent`, `axisBottom`, and `axisLeft` to compute scales and draw axes, while D3's `select` and `.join` operations efficiently append the circles, axis labels, and axis groups to the SVG.