This scatter plot visualizes the Iris dataset, displaying sepal length on the x-axis and petal length on the y-axis. Points are colored by species (setosa, versicolor, virginica) using a categorical color scale. The visualization is built with D3 v6, using `d3.csv` to load data from a GitHub Gist, `d3.scaleLinear` for axes, `d3.axisLeft` and `d3.axisBottom` for tick marks, and `d3.scaleOrdinal` for species-based coloring. An SVG legend identifies the three species.