Incremental Static Regeneration (ISR) is not just caching, but the ability to cache and revalidate the cache on the CDN once it expires.

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Incremental Static Regeneration (ISR) is a caching technique that allows for caching and revalidating the cache on a CDN. It can save on hosting and database costs and is supported by Vercel's Next.js and SvelteKit frameworks. Other CDNs and hosting providers may support ISR, but not on-demand revalidation. Edge databases can provide similar benefits to ISR, saving money and improving site performance.

The Guide for On-Demand ISR