If you would like keep some content hidden from the public eye, you could activate password protection for a specific folder - either the primary site folder or any other one below it. If this feature is active, a pop-up shall appear anytime somebody tries to open the folder in question or clicks on a direct link that goes a few levels deeper, so login details will be necessary for www.domain.com/folder/image.jpg in case you have protected just the domain.com folder. When the credentials are not valid, a “403 Forbidden” message will appear and there's no method of getting around this restriction, so you can rest assured that nobody will be able to access the secured content. The option can be useful in a number of cases - if only certain people must be able to see specific files, if you are building a website and you don't want people to see it before it's completed, and so forth.