This example shows a force-directed network graph representing companies and the connections between them. It visualizes companies as circular nodes with labels, linked by lines to show relationships. The data is loaded from `companies.json` using `d3.json`. The graph is rendered as an SVG using D3 v6, with the layout computed by `d3.forceSimulation`, which combines `d3.forceLink`, `d3.forceManyBody`, and `d3.forceCenter` to position nodes. Node icons and sector information exist in the data but are not displayed in this rendering.