An HTTP Error 503, often known as "Service Unavailable," indicates that the server is unable to handle the request, which is usually due to overload or maintenance. This is a temporary server-side issue, which does not affect your browser or internet connection. To resolve the issue, customers can reload the page, verify their internet connection, clear their browser's cache, or use a new browser or device. If the problem persists, it is most likely a server-side issue that must be resolved by the website administrator or hosting provider.