In the Domain Name System, a subdomain is described as a domain which lies in the hierarchy below another domain.
Usually this means domains in the third or further level.
Example hierarchy of a subdomain:
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Top Level Domain: |
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com. |
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Second Level Domain: |
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acme-travel.com |
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Subdomain: |
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shop.acme-travel.com |
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Hostname: |
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www.acme-travel.com |
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Example uses:
Subdomains can be used for individual web presences (www.en.acme-travel.com, www.de.acme-travel.com, ...) for distributed branches or company structures.
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