Answer
Fiber breaks rendering into small interruptible units, allowing React to pause, resume, or restart work. This prevents UI blocking, enables concurrency, and improves responsiveness during heavy updates.
Quick Answer
The old stack reconciler was recursive and synchronous — once started, it couldn't be interrupted. Fiber is a linked-list-based architecture where each unit of work (fiber) can be paused and resumed. This enables React to split rendering into small chunks, yield to the browser, and prioritize urgent updates (like user input) over non-urgent ones.
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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