The Cache database is used to allow for as much dynamics as possible while increasing the performance of the website at the same time.
you@web is a dynamic content management system. This means that the current page is "assembled" during runtime. When a high number of readers try to access the site at the same time this might lead to an increase in access times.
Caching ensures that, if possible, readers will access already prepared HTML documents that do not have to be generated anew. If and for what period of time different elements (e.g. navigators) will be stored in the cache is determined by the administrator individually. Cache documents also facilitate the personalization of web content.