React Hooks are functions that allow functional components to use state and lifecycle features that were previously only available in class components. They were introduced in React 16.8 as a way to enable stateful logic in functional components, making them more powerful and reducing the need for class components.

Here are some commonly used React Hooks:

1. useState:

  • Allows functional components to have local state.
  • Syntax: `const [state, setState] = useState(initialState);`

2. useEffect:

  • Allows functional components to perform side effects (e.g., data fetching, subscriptions) after the component renders.
  • It serves a similar purpose as `componentDidMount`, `componentDidUpdate`, and `componentWillUnmount` lifecycle methods in class components.

3. useContext:
   - Allows functional components to subscribe to a context without introducing a new consumer.
   - It's used to consume values from a React context.
4. useReducer:
   - A more advanced alternative to `useState`. It is often preferable when the next state depends on the previous one.
   - It's useful for managing more complex state logic.
5. useCallback and useMemo:
   - `useCallback` is used to memoize functions and prevent unnecessary re-renders.
   - `useMemo` is used to memoize values and prevent unnecessary calculations.

These are just a few examples of the many hooks available in React. Hooks provide a more concise and readable way to manage state and side effects in functional components, and they have become a standard practice in modern React development.