This D3.js scatter plot template visualizes the Iris flower dataset, plotting petal length against sepal length. Each of the 150 data points is colored by species (setosa, versicolor, or virginica), with hover tooltips showing exact coordinates. Using SVG rendering, the code loads the CSV via `d3.csv`, applies `d3.scaleLinear` for both axes, and creates circles with `d3.axisLeft` and `d3.axisBottom` for labeled axes. The `d3.join` pattern binds data, while a custom `fillColor` function assigns species-specific hues.