If a certain page on a site does not load for some reason or in case a link is not working, the site visitor will see an error page with some generic message. The page shall have nothing in common with the rest of the site, that could make the visitor leave your website. A potential solution in cases like this is a function made available from some hosting service providers - the ability to set up your own custom error pages that will have the exact same design and style as your website and which can contain any text or images you want dependent upon the specific error. There are 4 popular errors that can occur and they involve these particular 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 some page, but you haven't done this yet; 403, if you don't have an authorization to view a particular page; and 404, if a link which you've clicked leads to a file that doesn't exist. In any of these scenarios, visitors will be able to see your personalized content instead of a generic error page.