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How the Virtual DOM Works in React (And Why It Exists)
Frontend7 min readAug 23, 2026

How the Virtual DOM Works in React (And Why It Exists)

Every React developer has heard "Virtual DOM" a hundred times, but few can explain what it actually does. This blog breaks down the real problem it solves, how React's diffing algorithm decides what to update, and why that matters for how you write components.

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