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Web & Internet Definitions

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Definition of Canonical Name

(CNAME) A host’s official name as opposed to an alias. The official name is the first hostname listed for its Internet address in the hostname database, /etc/hosts or the Network Information Service (NIS) map hosts.byaddr (’hosts’ for short). A host with multiple network interfaces may have more than one Internet address, each with its own canonical name (and zero or more aliases). You can find a host’s canonical name using nslookup if you say

set querytype=CNAME

and then type a hostname

In a web page’s meta tags, you can now assign the primary domain to your page/website with the tag:
<link rel="canonical" href="" />