A fully qualified domain name (FQDN) is the complete domain name of a host or a computer. The same way a regular domain is composed of the TLD (.com) and the actual name (HostingTribunal), an FQDN adds a hostname to the mix. It could be WWW for the global network or something else, like “mail” or “ftp.” FTP.HostingTribunal.com is an FQDN, as it specifies completely what is to be accessed.