Website "cache" is temporary storage (caching) of web-based content: Web pages, documents, images, etc. Website caching is used in order to improve website speed and performance, as temporarily storing web-based content helps reduce server lag.
Caching on Live Open Berkeley Websites
All live Open Berkeley websites have caching set to 15 minutes in order to help with overall site speed and performance. This means that when you make an update and save, an anonymous visitor (who is not signed in) might not see your changes for up to 15 minutes.