Answer
For code splitting it waits for dynamic imports; for data fetching it waits for a Promise to resolve.
Quick Answer
For code splitting (React.lazy), Suspense catches the lazy import promise and shows a fallback while the chunk loads. For data fetching, Suspense catches a data-fetching promise thrown by the component — but this requires a Suspense-compatible data library (like SWR, React Query, or Server Components). The mechanism is the same; the integration differs.
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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