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Explanation: The useState hook is used to create and manage local component state in functional components.
Explanation: ReactDOM.render() is used to render a React element into the DOM.
Explanation: JSX is a syntax extension that allows mixing HTML with JavaScript.
Explanation: The useEffect hook is used to perform side effects like data fetching or DOM manipulation.
Explanation: The virtual DOM is a lightweight copy of the real DOM that React uses for efficient updates.
const [count, setCount] = useState();
Explanation: If no argument is passed to useState, the default state is undefined.
Explanation: Props are used to pass data from parent to child components in React.
Explanation: React.memo is a higher-order component that prevents re-rendering if props do not change.
Explanation: Keys help React identify which items have changed, been added, or removed.
Explanation: Custom hooks allow you to extract and reuse logic between components.