Answer / Amit Bhatnagar

In React, `useEffect` is a built-in hook that lets you perform side effects in function components. It's used to perform actions such as fetching data, manipulating the DOM, and more. Here's a basic example:

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

function Example() {
const [count, setCount] = useState(0);

useEffect(() => {
document.title = `You clicked ${count} times`;
}, [count]); // This is the dependency array - it tells React to re-run the effect when count changes.

return (
<div>
<p>You clicked {count} times</p>
<button onClick={() => setCount(count + 1)}>
Click me
</button>
</div>
);
}
```

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