Domain Explained

Domain is the distinguished part of an abstract or physical space where something exists, is performed, or valid. For example, we may talk about: domain of interest, domain of activity

It also has several meanings:

General

some kind of territory, such as (for example) a demesne or a realm
synonymous with a metaphorical field, e.g. "the domain of computer science"
- atomic domain - a domain whose elements are classified as indivisible units
a field of study
public domain, a body of works and knowledge without proprietary interest
eminent domain, the power of government to confiscate private property for public use

Places

The Domain, a shopping mall in Austin, Texas, USA
in several Commonwealth countries, the name for parkland made available for public use by the monarch or their representative, the Governor. Examples include:
- The Domain, Sydney: a large open space near the central business district of Sydney, Australia
- Kings Domain, Melbourne: in Victoria, Australia
- Queens Domain, Hobart: in Tasmania, Australia
- Auckland Domain: a large inner-city park in Auckland, New Zealand containing an ancient volcano and the War Memorial Museum
- Throughout New Zealand a Town Domain is typically a public sport area administered by a Domain Board.
The Domain Tunnel, Melbourne: a tunnel that runs underneath the Yarra River and the Kings Domain in Victoria, Australia

Sciences

domain (biology), a subdivision even larger than a kingdom
protein domain, an autonomously folding functional module of a protein
domain (physics), a region of a solid inside which a property is uniform (for example magnetic domain in ferromagnetism)

Mathematics

In mathematics domain can refer to:

the domain of a function
one of the domains of a relation
an ordered structure studied in domain theory
a ring-theoretic domain, an integral domain or a Euclidean domain - types of ring
an open and connected set
domain of discourse in symbolic logic

Information technology

In information technology, the term domain can refer to:

Domain name, Internet domain name (most frequently ending on .com)
a Windows Server domain, a centrally-managed group of computers using the Windows operating-system
a broadcast domain in computer networking
an application domain - the kinds of purposes for which users use a software system
a software engineering domain - a field of study that defines a set of common requirements, terminology, and functionality for any software program constructed to solve a problem in that field. See also domain-specific programming languages.
a CLR application domain, a mechanism for separating executed applications (similar to a process)
In Database Theory, a data domain is a set of all permitted values.
a workstation operating system called Domain/OS.
a group of computers on a network that share a common directory or storage locations.

Music

Domain (album), the debut album by the British metal band Above All
Domain (band), a German heavy metal band