what is meant by cache

Here is some sample code that caches objects:

http://www.vipan.com/htdocs/cachehelp.html

And of course I need to add that caching makes sense only if the data doesn't change often. If the data changes all the time then caching is not required, since caching refers to unchangable data.

Cache is nothing but ------>  if ur going to open a one page then that page will be downloaded form the server . But again ur going to open that page means then borwser refer the cache if its there means
then it will take the browser cache itself not go to server .

http://en.wikipedia.org/wiki/Cache-Memory   

check this you will find the diffrenet type of cahe !!