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And one more important thing… React is declarative. That means… we describe what the UI should look like… and React handles the updates. In interviews… always mention these keywords… Component-based… Reusable UI… Virtual DOM… and Declarative approach. What is Virtual DOM? “Virtual DOM… is a lightweight copy… of the real DOM. Instead of updating the real DOM directly… React first updates the Virtual DOM. When something changes… React creates a new Virtual DOM.