What is the virtual DOM in React?

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• It is a JavaScript object that mimics the structure of the actual DOM.

• When changes are made to a component’s state or props, React updates the virtual DOM first.

• React then compares the new virtual DOM with the previous one using a process called "diffing."

• Based on this comparison, React determines the minimal number of changes required to update the real DOM.

• Finally, it performs those updates in the most efficient way possible.

Why Use a Virtual DOM?

• Performance: The real DOM is slow to update. By batching and minimizing DOM operations, React boosts performance.

• Efficient Rendering: Only the components that actually change are re-rendered.

• Predictable UI: Changes go through React js controlled rendering cycle, reducing bugs and side effects.

Example:

If a user types in an input field, React doesn’t update the entire page. It updates the virtual DOM, finds the small change (just one character), and updates only that part of the real DOM.

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