To visualize data using a scatter plot in D3, you represent each data point as an SVG circle element. The cx and cy attributes of each circle determine its horizontal and vertical position within the SVG canvas. Typically, you map your data’s x and y values directly to these attributes, but you may need to adjust or scale them to fit your SVG’s dimensions. For example, if your SVG’s height is 120, you might use height - d.y for the cy value so that higher data values appear higher on the chart, matching traditional graph orientation.

You can further customize each data point’s appearance by setting the r attribute for the circle’s radius, the fill color for the interior, and the stroke for the outline. This gives you full control over how each point is displayed, making it easy to highlight patterns or trends in your data.