Definition of domain

The set of possible values that you can specify for an independent variable in a function, or for a database attribute.

In the Internet and other networks, the highest subdivision of a domain name in a network address, which identifies the type of entity owning the address (for example, .com for commercial users or .edu for educational institutions) or the geographical location of the address (for example, .fr for France or .sg for Singapore). The domain is the last part of the address (for example, www.acm.org).

A collection of computers in a networked environment that share a common database, directory database, or tree. A domain is administered as a unit with common rules and procedures, which can include security policies, and each domain has a unique name.

A set of records defined by a table, a query, or an SQL expression.

In Active Directory, a collection of computer, user, and group objects defined by the administrator. These objects share a common directory database, security policies, and security relationships with other domains.

An internet address owned by a company, organisation or individual, such as jonstorm.com, nasa.gov or bbc.co.uk. See alsoTLD,- How web addresses work.

The unique name that identifies an internet site. Domain names always have two or more parts separated by dots.