This example visualizes a force-directed network graph, showing how nodes with varying sizes and link connections settle into a stable layout. The graph uses `d3.forceSimulation` and `d3.forceLink` to compute the node positions and link distances, while `d3.select` and `d3.zoom` handle the interactive panning and zooming. The visualization is rendered with SVG elements using the `d3.drag` behavior for node repositioning. The data is loaded from a CSV file containing node and link information, and the color of each node is assigned based on a categorical scale.