It seems not strange if we had ever hear what is "Internet Cache".
Whenever we browse internet, browser will load file from internet. When that file arrived,
the file will be saved in cache.
When we browse again, browser will check if data already in cache. If data have already in
cache then data will be load without loading data from internet. If not already in cache or
the data need to update it's information then browser will load file from internet.
By "Internet cache", our browsing speed increased as the pages are retrieved from storage on our machine rather than the internet. But internet cache commonly can only functioning if internet is connected, as having a whole page is rare which can be used with offline browsing.
By “Internet cache”, we also can save internet cost, because we do not have to download files that mostly browsing, this is especially important on a dial up connection (some people still use them!)
For information about using the cache on your partitcular webbrowser then have a look on the web, for internet explorer there is a Microsoft article at http://support.microsoft.com/kb/263070
which you may find useful. Be aware though, there are a number of disadvantages to the cache - firstly security (people can view what you have been looking at) and secondly if the page is very dynamic you might be looking at an older version than is currently online (although the web designer can use options to turn caching off to a particular page.)