Virtual DOM in React

The Virtual DOM is a key concept in React that enhances performance by reducing the amount of direct manipulation of the real DOM.

Initial Render: React creates a virtual DOM, a lightweight representation of the actual DOM elements, during the first render of the app.
State/Props Update: When a component’s state or props change, React updates the virtual DOM first.
Reconciliation: React compares the updated virtual DOM with the previous version (called "diffing") to detect changes.
Efficient Update: React then updates only the parts of the real DOM that have changed, minimizing costly DOM operations.

Minimized Repaints/Reflows: By updating only the parts of the real DOM that have changed, React avoids unnecessary reflows and repaints, leading to better performance, especially in large applications.
Batching Updates: React groups multiple state updates into a single render cycle, reducing the number of operations on the DOM.
Optimized Rendering: The virtual DOM allows React to perform efficient comparisons of changes and apply them to the real DOM in the most optimized way.

The Virtual DOM improves performance by reducing unnecessary interactions with the real DOM and ensuring that only the necessary updates are applied.