What is caching?

Caching is the process of temporarily storing data in a fast access storage (cache) to speed up subsequent access to it. Instead of requesting data from a slow source (such as a database or remote server) each time, the system first checks the cache and, if the needed data is there, uses it.

Example: a web browser caches images and pages so that revisiting a website loads faster.

Caching helps improve performance and reduce load on main resources.