React Basics: How to Use React useCallback Effectively

The useCallback hook prevents unnecessary component rerenders by memoizing function definitions between renders. When callback functions are passed as props to memoized child components, React recreates them on every render, causing performance issues. useCallback maintains stable function references unless dependencies change, optimizing performance in scenarios like passing callbacks to React.memo components, custom hooks, and useEffect dependencies. Best practices include accurate dependency arrays, avoiding overuse, and writing components that minimize the need for memoization.