If you have looked at a lot of Internet sites, you've probably encountered some error message every now and then. An error can take place when the hosting server cannot process a request (Error 400), if you have to log in so as to see some content and you haven't done so (Error 401), if you are not allowed to access a webpage (Error 403) or if a link leads to a file which isn't on the web server (Error 404). Getting this sort of messages can sometimes be annoying because the pages have absolutely nothing in common with the actual Internet site. That’s why some web hosting providers permit you to use your own error pages that will match the layout of your own site and which may have any content that you want - details why the error has taken place, a suggestion what you can do or even some witty remark. Such a feature shall help you keep the visitor on the website irrespective of the error and the reason for it.