resources
Cache memory
Cache memory - Used to store web pages you have seen already. When you go back to those pages they'll load more quickly because they come from the cache and don't need to be downloaded over the internet again. Sometimes this can be problematic for the site if pages are "dynamic". If a browser reloads a page from cache rather than by re-requesting from the server, it may receive an out-of-date page.
For this reason, web pages contain "meta-information" designed to tell the browser how long a page should be cached for. A page that is dynamic can be served by the server with meta information telling the browser not to cache that page. However not all browsers interpret the meta information the same way, which can at times lead to strange behaviour where a users browser reloads an "old" page from cache rather than re-requesting it again from the server. Browsers commonly have a "refresh" command (for instance the F5 key in IE) that tells the browser to re-request the page from the server rather than reloading it from cache.
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