I explained that the Virtual DOM is a lightweight JavaScript representation of the real DOM. When the state of a React component changes, a new Virtual DOM tree is created. React then uses a diffing algorithm to compare the new Virtual DOM with the previous one and identifies the minimal number of changes needed to update the real DOM. This improves performance because direct manipulation of the real DOM is relatively slow, while working with the Virtual DOM in memory is much faster. By batching updates and re-rendering only the components that actually changed, React ensures high efficiency even in large applications.