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Then, what is virtual dom and real dom?

In React, for every DOM object, there is a corresponding “virtual DOM object.” A virtual DOM object is a representation of a DOM object, like a lightweight copy. A virtual DOM object has the same properties as a real DOM object, but it lacks the real thing's power to directly change what's on the screen.

Also Know, why virtual Dom is faster? No, React Virtual DOM is not faster than real DOM. The real DOM itself is fast, it can search, remove and modify elements from the DOM tree quickly. The real benefit from Virtual DOM is it allows calculation the different between each changes and make make minimal changes into the HTML document.

Simply so, what is virtual Dom and how it works?

Like the actual DOM, the Virtual DOM is a node tree that lists elements and their attributes and content as objects and properties. React's render() method creates a node tree from React components and updates this tree in response to mutations in the data model, caused by actions.

How does virtual Dom improve performance?

React uses virtual DOM to enhance its performance. It uses the observable to detect state and prop changes. React uses an efficient diff algorithm to compare the versions of virtual DOM. It then makes sure that batched updates are sent to the real DOM for repainting or re-rendering of the UI.