Besides a normal hostname, many computers have nicknames, which is useful if you wish to identify particular services without having to rename computers in your domain, such as www.smallorg.org. The CNAME record links nicknames with the real hostname.
The format of the CNAME record is nickname [TTL] [class] CNAME hostname
The nickname parameter refers to a hostname already defined in an A record. This feature allows you to create common names for hosts, such as www for web servers or ftp for FTP servers, then point those names to the appropriate real server name that hosts that service.
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