What it means in plain language
Cache memory is a mechanism for temporarily storing previously prepared data, thanks to which subsequent requests can be served faster.
Where it genuinely helps
A cache stores a prepared result closer to the user or application, reducing response time while sometimes serving older data.
What to decide before acting
Define what may be cached, for how long, who invalidates it and which user data must never enter shared storage.
How to tell whether it works
Test hits and misses, headers, publication purges, language variants and behaviour when the cache layer fails.
