If a specific page on a site doesn't load for some reason or in case a link is not working, the visitor shall see an error page with some generic message. The page shall have nothing in common with the rest of the website, which can make the visitor leave your site. A potential solution in cases like this is a feature offered by some website hosting companies - the option to set your own customized error pages which shall have exactly the same design as your site and that may contain any images or text you want depending on the specific error. There are four standard errors that may take place and they involve these particular so-called HTTP status codes - 400, when your Internet browser sends a bad request to the web server and it cannot be processed; 401, in case you are supposed to log in to see some web page, but you haven't done so yet; 403, if you do not have an authorization to see a certain page; and 404, in case a link which you have clicked leads to a file which does not exist. In all of these scenarios, site visitors shall be able to see your personalized content instead of a generic error page.