If a particular page on an Internet 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 shall have nothing in common with the rest of the website, which could make the visitor leave your website. A solution in such a case is a function made available from some website hosting service providers - the option to set up your own custom error pages that shall have identical design as your Internet site and which can contain any images or text you want dependent upon the particular error. There are four common errors which may take place and they involve these particular so-called HTTP status codes - 400, when your browser sends a bad request to the hosting server and it can't be processed; 401, in case you are supposed to log in to see a page, but you have not done this yet; 403, if you don't have a permission to view a particular page; and 404, when a link that you have clicked leads to a file that does not exist. In any of these situations, visitors shall be able to see your customized content instead of a generic error page.