Web Development
web
performance
backend
What is Caching?
Definition
Caching stores copies of data in faster-access locations to reduce latency and load. Web caching includes browser caches, CDN edge caches, reverse proxies (Varnish/Nginx), and application caches (Redis/Memcached).
Why It Matters
Caching is the #1 technique for improving application performance. Proper HTTP caching headers (Cache-Control, ETag) reduce server load and page load times. Redis caching eliminates repeated database queries. Every high-traffic site relies on caching.