Caching refers to the process of temporarily storing files in a repository for quick access. When a file, such as a Web page, is stored on a cache, it can be accessed without returning to the original server, thus reducing server load and response time. A cache can exist in a section of a computer's main memory or as an independent high-speed storage device.

Large organizations or institutions use large caches to distribute and update data that is frequently accessed by users. Local server caches, such as corporate LAN servers also use this method to reduce network traffic and server load. Caching is important for ensuring adequate response times in CM systems because serving custom pages on the fly can be extremely process-intensive, even on low-traffic sites.