This example shows a small network of six people connected by weighted links, with each node labeled by name and grouped by color. The visualization uses the D3.js v4 force layout via `d3.layout.force` to position nodes and links dynamically. SVG circles and text elements render the graph, with link stroke widths proportional to the `weight` attribute from the JSON data. Node positions update on each `tick` event, and nodes support drag interactions through `force.drag`.