Answer
Hydration attaches event listeners and React behavior to server-rendered HTML to make it interactive.
Quick Answer
Hydration attaches React's event handlers to server-rendered HTML so the page becomes interactive. The server sends HTML (fast first paint), and the client-side React code runs and "takes over" the DOM without re-rendering everything. If the client render doesn't match the server HTML, React warns about a hydration mismatch.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ