Answer
Islands hydrate only interactive parts of the page. React frameworks implement selective hydration for these components.
Quick Answer
Islands of interactivity mean only specific interactive parts of the page hydrate — the rest is static HTML. React supports this via Server Components (never hydrate), Suspense boundaries (hydrate independently), and React.lazy (load Client Components on demand). Frameworks like Astro implement full island architecture using React for the interactive islands.
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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