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.