What is React.memo, and how does it help with performance optimization?

React.memo memoizes functional components to prevent re-renders when props haven’t changed.

⚙️ Example

const Button = React.memo(({ onClick }) => {
  console.log('Rendered!');
  return <button onClick={onClick}>Click</button>;
});

✅ If the parent re-renders but props are the same, React skips rendering this component.

Use it wisely—overusing React.memo can hurt performance.