When you view Web pages with browsers such as Internet Explorer, Firefox, Safari, and Netscape Navigator(Mozilla), the browser will cache the page. Caching stores a copy of that page in a (somewhat hidden) folder on your computer. When you view the same page again at a later time, the browser will display the saved page from your computer instead of downloading it from the Internet. Caching makes for faster Web browsing, by speeding up the time it takes to access Web pages. Depending on the preferences you have set, browsers also can quickly compare the saved page with the current one on the Internet, and load the latest version.

However, there are some drawbacks to caching. If you visit a previously viewed page again at a later time, the browser might load the cached page without checking for an updated version. You might be looking at outdated information, particularly if you are viewing content that is constantly changing such as your web site being developed (pages updated), events on a news site such as CNN, or if you are working with a Web-based application that has database-generated information that changes.

The REFRESH/RELOAD command will (usually) force loading the latest copy of the web page from the server.  This ensures that you are seeing the latest version of the page. In Internet Explorer and Netscape on a PC,  the Function Key  “F5” (near the top center of the keyboard) will do the trick, otherwise find REFRESH or RELOAD in the little tool bar across the top of your window or in the VIEW> drop down command list.

A note to web designers:
If a client is not seeing the latest file version even after doing a REFRESH, use the following steps to debug and resolve:

An unrelated comment about caches and DNS:

ISPs' DNS servers can also have sticky entries when you update the DNS server settings in the registry records to change hosts. This one has no solution except to wade thru the ISP's technical support, get them to believe you and have them force an update to their DNS database and/or reboot their DNS server. On rare occasions, this can be the Registrar's problem, but usually it's the DNS server.

Note: Cached pages are temporary (extra) copies of web pages, and it does not hurt anything to delete them (clean up the cache).

Broswer versions may differ slightly, but below gives you the strategy of what to do.

Follow these steps to delete cached pages in Internet Explorer:

Follow these steps to delete cached pages in Netscape Navigator(Mozilla):

If you want to change your settings for caching pages: