In the
Domain Name System (DNS) hierarchy, a subdomain is a
domain that is part of a larger domain. For example, "example.com" is a subdomain of the "com"
top-level domain (TLD) while "www.example.com" is a service in the domain "example.com". In fact, the "com" TLD is a subdomain of the
root domain, ".". This hierarchical organisation is similar to that in a
filesystem; something is a subdomain if it could be equated to a folder, and a record within that subdomain to a file. Note, though, that DNS names are written in descending hierarchy right-to-left, where filesystems are written left-to-right.
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