Both do on-demand ISR but differ in granularity, cache keys, and Router Cache invalidation.
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revalidateTag vs revalidatePath — when to use which?
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revalidationisrcaching
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revalidateTag purges by Data Cache tag wherever it is used; revalidatePath purges a specific route — prefer tags for CMS content, path for page-centric invalidation.
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Dossier 71 of 95 decoded in the Next.js track. One more won't hurt.