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What is the purpose of not-found.js in Next.js?

The not-found.js file defines a custom UI for missing routes or unavailable content. It works with the notFound() function to display a user-friendly 404 page instead of a generic browser error. It improves navigation experience and error handling.

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How does server-side rendering (SSR) in Next.js App Router differ from Static Site Generation (SSG)?

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What is Next.js and why is it used?

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What is the difference between React and Next.js?

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JB

Jeevan Bhargav

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This answer is calibrated for technical interviews. Verify benchmarks in local sandboxes before deploying.