Multi-tier caching.

also: multi-tier cache · caching hierarchy · cache hierarchy · layered caching

Caching at several layers (browser, CDN, API gateway, application cache, database) so most requests stop as early as possible.

the two-minute refresher

Each layer closer to the user is faster and cheaper but harder to invalidate.
Browser: per user. CDN: shared, at the edge. Gateway and Redis: inside your network.
Decide what belongs where: public static content at the edge, private data deeper in.
Invalidation has to reach every tier, usually via events plus TTLs.

also: multi-tier cache · caching hierarchy · cache hierarchy · layered caching

Caching at several layers (browser, CDN, API gateway, application cache, database) so most requests stop as early as possible.

Each layer closer to the user is faster and cheaper but harder to invalidate.
Browser: per user. CDN: shared, at the edge. Gateway and Redis: inside your network.
Decide what belongs where: public static content at the edge, private data deeper in.
Invalidation has to reach every tier, usually via events plus TTLs.