A memory leak in React occurs when a component unintentionally holds onto memory resources that are no longer needed, causing the application to gradually use more and more memory over time, potentially impacting performance; Solution: Solutions to prevent memory leaks in React: Use the cleanup function in useEffect: Within the useEffect hook, return a function that cleans up any resources like event listeners, subscriptions, or timers when the component unmounts. Avoid unnecessary global variables: Limit the scope of variables to the component where they are needed to avoid accidental global references. Optimize large list rendering: Use techniques like key props and React.memo to efficiently update only necessary parts of a list when data changes. Manage subscriptions carefully: Ensure you unsubscribe from any external services or data streams when the component unmounts. Use ref objects cautiously: If you need to access a DOM node directly, clean up any references to the ref object when the component unmounts. Monitor memory usage with developer tools: Use your browser's developer tools to identify potential memory leaks by analyzing heap snapshots and tracking memory usage over time. Consider third-party libraries carefully: Check if third-party libraries you use have known memory leak issues and use them responsibly.