React's Virtual DOM is a lightweight in-memory representation of the real DOM that allows React to simulate changes without manipulating the actual DOM. Reconciliation updates this virtual copy by comparing it with the previous state using a diffing algorithm, which identifies changes and generates patches for efficient updates to the actual DOM.
React uses a lightweight in-memory representation of the real DOM, called the Virtual DOM, to optimize rendering and re-rendering. When state changes, an updated Virtual DOM snapshot is compared with the previous one, identifying what's changed, and only necessary parts of the actual DOM are updated. Techniques like memoization and immutability can maximize performance by minimizing unnecessary re-renders and efficiently detecting changes between snapshots.
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