Revalidating DataNext.js allows you to update specific static routes without needing to rebuild your entire site. Revalidation (also known as Incremental Static Regeneration) allows you to retain the benefits of static while scaling to millions of pages.
There are two types of revalidation in Next.js:
Background: Revalidates the data at a specific time interval.
On-demand: Revalidates the data based on an event such as an update.
Background Revalidation
To revalidate cached data at a specific interval, you can use the next.revalidate option in fetch() to set the cache lifetime of a resource (in seconds).
 fetch('https://...', { next: { revalidate: 60 } })
If you want to revalidate data that does not use fetch (i.e. using an external package or query builder), you can use the route segment config.