Domain may refer to: Film Domain (2009 film), a French film Domain (2016 film), an American film The Domain (film), a 2019 Portuguese film Information technology Administrative domain Broadcast domain, in computer networking, a group of special-purpose addresses to receive network announcements Collision domain Domain (software engineering), a field of study that defines a set of common requirements, terminology, and functionality for any software program constructed to solve a problem in a given field Application domain, a mechanism used within a Common Language Infrastructure to isolate executed software applications from one another Programming domain, a set of programming languages or programming environments that were engineered specifically for a particular domain (software engineering) Network domain, a named grouping of hosts and servers with managed login, access to resources, and permissions. Domain name, a label that identifies a realm of administrative autonomy, authority, or control within the Internet Mathematics Domain (mathematical analysis), an open connected set Domain (ring theory), a nontrivial ring without left or right zero divisors Integral domain, a non-trivial commutative ring without zero divisors Atomic domain, an integral domain in which every non-zero non-unit is a finite product of irreducible elements Bézout domain, an integral domain in which the sum of two principal ideals is again a principal ideal Euclidean domain, an integral domain which allows a suitable generalization of the Euclidean algorithm Dedekind domain, an integral domain in which every nonzero proper ideal factors into a product of prime ideals GCD domain, an integral domain in which every two non-zero elements have a greatest common divisor Principal ideal domain, an integral domain in which every ideal is principal Unique factorization domain, an integral domain in which every non-zero element can be written as a product of irreducible elements in essentially a unique way Domain of a function, the set of input values for which the (total) function is defined Domain of definition of a partial function Natural domain of a partial function Domain of holomorphy of a function Domain of an algebraic structure, the set on which the algebraic structure is defined Domain of discourse, the set of entities over which logic variables may range Domain theory, the study of certain subsets of continuous lattices that provided the first denotational semantics of the lambda calculus Frequency domain, the analysis of mathematical functions with respect to frequency, rather than time Fundamental domain, subset of a space that contains exactly