This scatter plot visualizes the Iris dataset, comparing sepal length against sepal width across three species. The visualization uses D3.js methods like `scaleLinear`, `scaleOrdinal`, `extent`, `axisBottom`, and `axisLeft` to render the plot. An interactive legend highlights points of a selected species while dimming others, and hovering triggers opacity changes. The code loads the Iris data from a Gist URL via D3's `csv` parser and applies a BBC-inspired color theme for species differentiation.