This fork of a force-directed graph visualizes relationships between programming languages using a node-link diagram. The code uses `d3.forceSimulation` with forces for links, centering, charge, and X/Y positioning, and renders with SVG. Node size reflects link count, while link style (solid green vs. dashed black) and width distinguish connection weight values. Draggable nodes and curved paths are implemented via `d3.drag` and the tick function, with labels shown via SVG text elements.