A CNAME (canonical name) record is an entry in your DNS zone file which aliases an FQDN (fully qualified domain name) to another FQDN (such as www.yourdomain.com to yourdomain.com). In other words, the CNAME record specifies another domain name to which a visitor to the first domain would be directed.
Example CNAME record:
Alias: forum.yourdomain.com - Hostname: www.yourforum.com
This would cause visitors to forum.yourdomain.com to be redirected to www.yourforum.com.
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