React hooks are functions provided by React that allow functional components to have state, side effects, and other features that were previously only available in class components. They were introduced as a way to write reusable and stateful logic without using class components. Benefits of React hooks include: 1. State Management: React hooks provide the `useState` hook, which allows functional components to have local state. It enables you to declare state variables and update them using the provided setter function. This simplifies state management and reduces the need for class components. Example: 

import React, { useState } from 'react';

const Counter = () => {
  const [count, setCount] = useState(0);

  const increment = () => {
    setCount(count + 1);
  };

  return (
    

      
Count: {count}

      Increment
    

  );
};
2. Side Effects: React hooks provide the `useEffect` hook, which allows functional components to perform side effects like data fetching, subscriptions, or DOM manipulation. It replaces lifecycle methods such as `componentDidMount`, `componentDidUpdate`, and `componentWillUnmount`. Example: 

import React, { useState, useEffect } from 'react';

const DataFetcher = () => {
  const [data, setData] = useState(null);

  useEffect(() => {
    // Fetch data and update state
    fetchData().then((response) => {
      setData(response.data);
    });
  }, []); // Empty dependency array means the effect runs only once on mount

  return 
{data ? 
Data: {data}
 : 
Loading...
}
;
};
3. Custom Hooks: React hooks allow you to create custom hooks to encapsulate reusable logic. Custom hooks can be shared across multiple components, promoting code reuse and modularity. Custom hooks follow the naming convention of starting with "use" to indicate that they are hooks. Example: 

import React, { useState, useEffect } from 'react';

const useDocumentTitle = (title) => {
  useEffect(() => {
    document.title = title;
  }, [title]);
};

const Page = () => {
  useDocumentTitle('My Page');

  return 
Content of the page...
;
};
In the example above, the `useDocumentTitle` custom hook sets the document title based on the input value. The `Page` component uses the custom hook to set the title as "My Page". Conclusion : React hooks provide a more concise and functional approach to managing state and side effects in React components. They promote code reusability, improve readability, and simplify the development of complex UI logic.