Edge Functions
Traditionally there are two ways to serve content, statically from a Content Delivery Network (CDN) close to the user for fast response times, or dynamically, with personalization configured at the server level on each request. When deciding on how you want to deliver content to your applications visitors, you have to take into consideration the trade-offs that each of these two options offer.
https://vercel.com/docs/concepts/functions/edge-functions