It seems that I get asked about this over and over again . . . so I decided to create a page in our Resources section about it.
Here is the link . . .
Why would you need this?
Mainly, if you have made changes to your website, and are not immediately seeing the changes displayed.
The page explains why this happens, so check it out now . . .
By the way, there are instructions for PC & MAC, and all manner of browser types.