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Reference.org
Fully qualified domain name
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<p>A fully qualified domain name (FQDN), sometimes also called an absolute domain name, is a <a href="/facts/Domain_name/FDLD2m5G">domain name</a> that specifies its exact location in the tree hierarchy of the <a href="/facts/Domain_Name_System/rfxdWFsj">Domain Name System</a> (DNS). It specifies all domain levels, including the <a href="/facts/Top-level_domain/azjpPu2M">top-level domain</a> and the <a href="/facts/DNS_root_zone/pVhV8cWh">root zone</a>. A fully qualified domain name is distinguished by its unambiguous DNS zone location in the hierarchy of DNS labels: it can be interpreted only in one way. </p>