This example shows a scatter plot of sleep duration against age, with each circle representing a person’s data point. The visualization uses D3.js v6 to load a CSV dataset, apply linear scales, and render axes with labels. Circles are drawn with an SVG selection join, while the chart is built as a reusable function with configurable properties for width, height, data, margins, and radius. The plot is sized to fill the browser window and updates its dimensions accordingly.