CNAME Records

CNAME records are DNS records that are aliases. The relate one hostname to another.

Here is an example:

$ dig mail.sagonet.com cname
--------- Snip ------
;; ANSWER SECTION:
mail.sagonet.com.       300     IN      CNAME   mx.sagonet.com.

This means that mail.sagonet.com is an alias for mx.sagonet.com!