What is the Virtual DOM?

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The Virtual DOM (Document Object Model) is a concept used in modern web development frameworks like React to optimize and speed up updates to the user interface.

Traditionally, when something changes in a web page (like user input), the browser updates the real DOM, which can be slow and resource-intensive because it involves re-rendering parts of the page. To solve this, the Virtual DOM acts as a lightweight, in-memory copy of the real DOM.

When a change occurs:

1. The Virtual DOM is updated first, not the actual DOM.

2. Then, a process called "diffing" compares the new Virtual DOM with the previous version to detect what exactly changed.

3. Finally, only the changed parts are updated in the real DOM, rather than re-rendering the entire page.

This makes updates faster and more efficient, improving app performance and user experience. Developers also benefit from a more declarative way of coding interfaces — they describe what the UI should look like, and the framework handles how to update the DOM efficiently.

In short, the Virtual DOM enhances performance by minimizing direct interactions with the real DOM, enabling smoother and more responsive web applications.

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