Answer
Hydration boundaries create isolated hydration zones, enabling selective hydration and reducing blocking time.
Quick Answer
A hydration boundary separates server-rendered content that can be progressively hydrated from the rest of the page. In React 18, Suspense boundaries serve as hydration boundaries — React can hydrate sections independently and prioritize based on user interaction. Without clear boundaries, the entire page must hydrate as one block.
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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