This example shows a single yellow circle that follows the cursor across an SVG canvas, updating its position in real time based on mouse movement. Built with React and rendered as SVG, it uses the `useState` hook to track the mouse coordinates and the `useCallback` hook to handle `onMouseMove` events. The circle’s `cx` and `cy` attributes are bound to the current mouse position, and ReactDOM renders the component into a root element, with the canvas sized at 960 by 500 pixels.