This example presents a reusable D3.js scatter plot visualization of the classic Iris dataset, mapping petal length against sepal length. The SVG-based chart uses `d3.scaleLinear` for axis scaling, `d3.axisLeft` and `d3.axisBottom` for axes, and a custom `scatterPlot` module that encapsulates the rendering logic. Data is loaded from a remote CSV file via `d3.csv`, with numeric parsing applied to each column. The visualization demonstrates a black-and-white aesthetic with configurable dimensions, margins, and point radius, making it adaptable for various datasets, though it is specifically illustrated with flower measurements.