A D3.js scatter plot visualizes the Iris dataset, mapping petal length and petal width to the x- and y-axes, with each point colored by species (setosa, versicolor, virginica). The plot uses SVG rendering and the `d3.csv`, `d3.scaleLinear`, `d3.extent`, `d3.axisLeft`, and `d3.axisBottom` functions to load the data, set scales, and draw axes. The title is styled in red, and axis labels are set in green using SVG `text` elements.