CNAME - DNS Record

(Canonical name record). A type of DNS record. A CNAME record maps a single node of the name space.
The CNAME is an alias of one name to another: the DNS lookup will continue by retrying the lookup with the new name.
A CNAME record or Canonical Name record is a type of resource record in the Domain Name System (DNS) that specifies that the domain name is an alias of another, canonical domain name. This helps when running multiple services (like an FTP and a webserver; each running on different ports) from a single IP address. Each service can then have its own entry in DNS (like ftp.example.com. and www.example.com.). Network administrators also use CNAMEs when running multiple HTTP servers on the same port, with different names, on the same physical host.