"The cache—your browser's local storehouse of code and images downloaded from the Internet—exists to help your Web experience run smoother. If you visit the same sites again and again, your computer can save time and resources by not downloading the same files over and over again.

At least, that's how it's supposed to work.

Unfortunately, sometimes an error can occur with the files in your cache and things start to run funky. If that happens, you'll need to dump your browser's little data bank to get things back in order. Aside from usability issues, your cache also presents opportunities for capable ne'er-do-wells to find their way into your system and cause mischief OR they may exploit personal information inherent in your local cache files to steal your identity. And that's no good."