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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

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