First, there are people that don't want to use a CDN (don't trust them with censorship), or can't (local network). But you can cache other things that are not

First, there are people that don't want to use a CDN (don't trust them with censorship), or can't (local network). But you can cache other things that are not the entire page itself: - database queries - user sessions - api calls - page fragment - function memoization What's more, cache backends have the ability to expire things, which can be helpful for all sort of stuff.