Caching
Caching is the process used to save web content that is served, for viewing at a later time (cached on the client machine) or for others to view (popular pages, cached at the ISP for others to view who use that ISP to connect to the internet.) Google also caches content that is available for browsers' to view with the search results. The principle reason for caching is to improve the web browsing experience by increasing the speed web pages can be presented to the client. Caching does not work well if web pages are updated often, as older copies are cached which are then served to browsers. Caching is also an issue for content providers who wish to remove their content from the internet. They do not control the caching process and thus are unaware of the extent to wich the content has been cached across the internet.
