Cache

From the Simple English Wikipedia, the free encyclopedia that anyone can change

In computer science, a cache (pronounced "cash" /kæʃ/) is a copy of online internet content, which is kept in the memory of a user's computer. By storing this content (also called data) on the user's computer, computer applications there can use that data without requesting it from the server. This reduces the load on the server by reducing the number of requests sent to that server. This also makes the applications work faster, because they do not have to wait for the server to respond with new data. This can sometimes cause problems, if the server has new data but the data in the cache is too old. To avoid this problem, the cache can be refilled with new data from the server. This is called "refreshing the cache".

A cache server is a server which is used to store a cache of the web pages and send them to the users (clients).