FQDN
Fully Qualified Domain Name, a Domain Name that can be resolved both from within a Local Area Network an from the Internet.
An FQDN consist of a Domain Name and Top Level Domain. Top Level Domains include .com, .gov, and info, for example, or abbreviations of names of countries like .nl (the Netherlands) and .de (Germany, or Deutschland).
FQDNs can also be used to resolve hostnames within a private network, to route between different Local Area Networks, for example. In that case the Top Level Domain should NOT be identical to one of the public ones. Common choices are .local, .intranet, and .mycompany for example.