networking//cache

- A store that holds copies of frequently requested content closer to the consumer.

A store that holds copies of frequently requested content closer to the consumer.

CDNs distribute caches across edge PoPs worldwide; reverse proxies (Varnish, nginx) cache at the origin's front door.

Cache invalidation (knowing when stale data must be purged) remains one of the two hard problems in computer science.

Mirrors cache (hardware) and cache (disk), scaled up to geographic distances and HTTP semantics.