What is caching, and how can it be implemented in REST APIs?

Caching is storing frequently used data temporarily to reduce server load and improve

response time.

Implementation methods:

• HTTP caching headers (Cache-Control, ETag, Expires).
• Reverse proxies (Varnish, NGINX).
• In-memory stores (Redis, Memcached).
• Client-side caching using 304 Not Modified.