canonical name. When a nameserver looks up a name and finds a CNAME record,
it replaces the name with the canonical name and looks up the new name. These
should only be used when absolutely necessary. You have to be very knowledgable
in DNS management to be able to set up CNAME records.
One of the times where CNAME records can be useful is when you want a
subdomain to point to a mailserver outside of your domain. For example, if you want
"mail.example.com" to go to your registrar's mail server, instead of entering the IP
address, you could put in "mail.example.com CNAME webmail.domainname.com",
so that if the IP address of the mail server is changed, you won't have to make any
updates.
