Explain the concept of Incremental Static Regeneration in Next.js.
Instruction: Describe what Incremental Static Regeneration (ISR) is and how it works in Next.js.
Context: This question probes the candidate's knowledge of ISR, a key feature in Next.js for improving site performance without sacrificing content freshness.
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Incremental Static Regeneration lets a cached page be regenerated without rebuilding the entire site...