Explain the concept of Virtual DOM in React.

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The Virtual DOM in React is an abstraction of the real DOM that makes UI updates faster and more efficient. The real DOM (Document Object Model) directly represents the structure of a web page, but manipulating it frequently is slow because every update triggers re-rendering, recalculations of styles, and layouts.

To solve this, React creates a Virtual DOM, which is a lightweight copy of the actual DOM stored in memory. When a component’s state or props change, React doesn’t immediately update the real DOM. Instead, it updates the Virtual DOM first. React then uses a diffing algorithm to compare the new Virtual DOM with the previous version and figures out the minimal set of changes needed. Finally, only those specific changes are applied to the real DOM.

This approach drastically improves performance, reduces unnecessary re-rendering, and ensures a smoother user experience. Developers also benefit because they can write declarative code (“what the UI should look like”) while React efficiently handles the “how” behind updating the UI.

👉 In short:

• Real DOM: Direct but slow for frequent updates.

• Virtual DOM: Fast, in-memory representation.

• Benefit: Optimized, minimal updates = better performance.

Read More :

What are hooks in React? Name some commonly used hooks.

What is the difference between useEffect() and useLayoutEffect()?

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