In general, a domain is an area of control or a
sphere of knowledge.
1) In computing and telecommunication in general,
a domain is a sphere of knowledge identified by a name. Typically, the
knowledge is a collection of facts about some program entities or a number of
network points or addresses.
2) On the Internet, a domain consists of a set of
network addresses. This domain is organized in levels. The top level identifies
geographic or purpose commonality (for example, the nation that the domain
covers or a category such as "commercial"). The second level
identifies a unique place within the top level domain and is, in fact,
equivalent to a unique address on the Internet (an IP address).
Lower levels of domain may also be used.
Strictly speaking, in the Internet's domain name
system (DNS), a domain is a name with which name server records are associated
that describe sub domains or host.
For example, "whatis.com" could be a domain with records for
"www.whatis.com" and "www1.whatis.com," and so forth.
3) In Windows NT and Windows 2000, a domain is a
set of network resources (applications, printers, and so forth) for a group of
users. The user need only to log in to the domain to gain access to the
resources, which may be located on a number of different servers in the
network.
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