Explain the Virtual DOM in React.

At its core, the Virtual DOM allows React to minimize direct interactions with the actual DOM, which is known to be slow and costly in terms of performance. Whenever a component's state changes, React first updates this change in the Virtual DOM. Then, it compares the updated Virtual DOM with a pre-update version, identifying exactly what has changed. This process is known as "diffing." Once React knows which parts of the actual DOM need to be updated, it batches these changes and updates the DOM in the most efficient way possible. This selective rendering technique...