A single yellow circle follows the mouse cursor across an SVG canvas, responding to every pointer movement. Built with React 16.9 and ReactDOM, the application uses the `useState` and `useCallback` hooks to track the cursor's client coordinates and update the circle's `cx` and `cy` attributes in real time. The rendering approach is purely SVG, with a fixed viewport of 960 by 500 pixels. No external data source is involved; the visualization demonstrates interactive state management in a minimal React component.