A common use is to store information in a web browser. The cache contains information stored by a Web Browser on your hard disc so that you don't have to download the same material repeatedly from a remote computer. Browsers keep copies of all the Web pages that you view so that the pages can be redisplayed quickly when you go back to them.
ServiceDesk Plus has an in-built cache monitoring tool that provides a real-time view of the current state of dynamic cache which can be a critical performance metric. This can be accessed from the Community (headset icon) tab.