How SSR Works in React and Next.js: Built on the Server, Wired Up in the Browser

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AI Fusion Summary

Server‑Side Rendering (SSR) in React and Next.js delivers a fully built HTML page instantly, but the JavaScript that powers interactivity is not yet active. Hydration then connects event handlers to the existing DOM, enabling user interactions. This two‑step process ensures fast initial load times while maintaining dynamic functionality in the browser.
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