ISR
Incremental static regeneration — a Next.js rendering mode that serves cached HTML and regenerates it in the background after a TTL.
ISR (incremental static regeneration) is a rendering strategy popularised by Next.js. A page is statically generated at build time, served from a CDN cache, and silently regenerated in the background after a configurable revalidation interval. Visitors always get a fast cached response; the first visitor after the TTL expires triggers a background rebuild that updates the cache for everyone else.
ISR is the right rendering mode for content that updates regularly but doesn’t need to be live-fresh — public status pages, blog posts, comparison pages, sitemap entries. It gives near-static delivery speed without the deploy-to-update workflow of fully static sites.