What are subdomains?
Answer:
Subdomains are considered to be third level - a domain is second level (down a level from its main TLD - .com, .org, etc), and a subdomain is on level below its domain. An example of a subdomain is http://sports.yahoo.com - here, sports is a subdomain of yahoo.com
Subdomains are used as a way of building the main brand, but also designating the content to be separate. In the beforementioned case of Yahoo.com, subdomains such as movies., sports., finance., etc, are used to designate topical sections on the main Yahoo.com domain.
Most control panels now support subdomains out of the box, and allow a host to limit the number of subdomains available to an end user.
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