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Explanation

Virtual DOM is a lightweight copy of the real DOM used by React to improve performance.

Code:

const virtualDOM = { type: 'h1', props: { 
children: 'Hello' } };

Explanation

Instead of updating the real DOM directly, React first updates the Virtual DOM and compares the changes.

Code:

Old Virtual DOM -> New Virtual DOM ->
 Compare Changes

Explanation

The comparison process is called Diffing. React finds only the changed elements.

Code:

if(oldText !== newText) { updateDOM(); }

Explanation

After finding differences, React updates only the required parts in the real DOM. This process is called Reconciliation.

Code:

React updates only modified nodes 
instead of reloading the full page.

Explanation

Using Virtual DOM improves application performance because direct DOM manipulation is slow.

Code:

Virtual DOM -> Faster UI Updates

Explanation

Example: If only one button text changes, React updates only that button instead of the complete webpage.

Code:

Before: <button>Save</button> After: 
<button>Saved</button>