Answer
React re-renders a component when its state or props change or when its parent re-renders. Siblings do not re-render unless their props change.
Quick Answer
When state or props change, React re-renders that component and, by default, all its children — even if the children's props didn't change. React.memo, useMemo, and useCallback help break this chain by bailing out of re-renders when inputs haven't changed. Without memoization, re-renders cascade down the entire subtree.
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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