Answer
An error boundary catches runtime errors in child components and displays a fallback UI instead of crashing the entire app.
Quick Answer
Error boundaries are class components that catch JavaScript errors thrown by their children during rendering, in lifecycle methods, or in constructors. They prevent the whole app from crashing — instead, they render a fallback UI. You can't use hooks for this; class components with componentDidCatch are required.
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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