Performance · Website glossary

Cache

Quick answer · What is Cache?

A store of reusable results or data that can reduce repeated retrieval or computation.

IN PRACTICE

Cache: an example

A server reuses a prepared response rather than generating the same public page repeatedly.

KEEP IN MIND

Cached data can become stale; correctness and invalidation matter as much as reuse.

Put the idea to work

Frequently asked questions

What is a practical example of Cache?

A server reuses a prepared response rather than generating the same public page repeatedly.

What matters when cached data becomes stale?

Cached data can become stale; correctness and invalidation matter as much as reuse.

Which concepts should I read alongside Cache?

Browser cache: A browser's local storage of reusable web responses, governed by caching rules and validation behavior.
DNS cache: A temporary store of DNS answers kept to avoid repeating the same lookup immediately.