A network diagram displays character relationships from Les Misérables, with nodes representing characters and links showing their connections. Node color encodes group membership via a categorical color scale, while link thickness reflects relationship weight. The visualization uses D3 v5's force simulation (`d3.forceSimulation`) with link, charge, and center forces to position nodes. SVG circles and lines render the graph, with positions updated on each simulation tick. Data comes from a JSON file containing character IDs and weighted links.