This example shows a single yellow circle that follows the mouse cursor as it moves across an SVG canvas. Built with React and rendered as SVG, the circle’s position is updated on every mouse movement event using the `onMouseMove` handler and React’s `useState` hook. The cursor coordinates, obtained from the event’s `clientX` and `clientY` properties, directly set the circle’s `cx` and `cy` attributes, creating a simple interactive follower effect.