A network graph displays seven named nodes connected by weighted links, with node sizes and link thickness reflecting connection strength. The data, loaded from a JSON file, is rendered as an SVG using D3.js v4's force layout, which applies gravity, charge, and distance parameters to position nodes dynamically. Users can click and drag nodes to rearrange the network, while node labels and red-bordered yellow circles remain visible. The visualization uses `d3.layout.force` for simulation and `force.drag` for interactivity, with tick events updating link coordinates and node transforms.