If a certain page on a site does not load for some reason or in case a link is not working, the website visitor will see an error page with some generic message. The page will have nothing in common with the rest of the website, that may make the visitor leave your site. A likely solution in this case is a feature made available from some hosting service providers - the option to set up your own custom-made error pages which shall have identical design as your website and which could contain any images or text which you want depending on the particular error. There are 4 common errors that could occur and they involve the following so-called HTTP status codes - 400, when your browser sends a bad request to the web server and it can't be processed; 401, in case you are supposed to log in to see a webpage, but you have not done this yet; 403, if you do not have an authorization to see a specific page; and 404, when a link that you've clicked leads to a file which does not exist. In each of these situations, visitors shall be able to see your custom content instead of a generic error page.