Prefetching

Summary

Proactively fetching a resource (like the next page's JS/data) before the user actually navigates to it, so the transition feels instant.

• 1Notice how Next.js's `<Link>` automatically prefetches linked pages in the viewport.
• 2Learn `<link rel="prefetch">` for manually hinting future navigations.
• 3Understand the trade-off: prefetching uses bandwidth the user may not need.