In mathematics domain can refer to:

public domain, a body of works and knowledge without proprietary interest

domain is dealing with a function. In information technology, the term domain can refer to:

a field of study

one of the domains of a relation

an ordered structure studied in domain theory

The Domain, a shopping mall in Austin, Texas, USA

a workstation operating system called Domain/OS.

a broadcast domain in computer networking

an application domain - the kinds of purposes for which users use a software system

Domain (band), a German heavy metal band

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

some kind of territory, such as (for example) a demesne or a realm

eminent domain, the power of government to confiscate private property for public use

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

The Domain Tunnel, Melbourne: a tunnel that runs underneath the Yarra River and the Kings Domain in Victoria, Australia

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)

the domain of a function

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

a machine or virtual host on the Internet; the name of a domain (the "domain name") can be confused with the domain itself.

a Windows Server domain, a centrally-managed group of computers using the Windows operating-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 atomic values.