When someone visits a nonexistent page on your site, they are redirected to a 404 page. If your site does not have its own 404 page, the browser will use the one supplied by the server. This page won't have any information about your site, which is a bad thing. The visitor to your site is trying to reach your site so you should give them a way to get there. This package will allow you to do that. It redirects visitors to a page on your site where you can explain their link was invalid and offer them choices. This is not only much more user friendly but it cuts down on bandwidth usage on your server. This package should be installed in all shops since it can prevent the loss of customers.