Entity

(1) An entity that can have many properties (either declarative, procedural, or both) associated with it. (2) An instance of a class. A passive entity that provides information or data to subjects. An object can be a file, a database, a computer, a program, a process, a file, a printer, a storage media, and so on. Passive entity containing or receiving information. Access to an object implies access to the information it contains.
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Permits the active or passive transfer of information between separated points without physical connection. Active information transfer may entail a transmit and/or receive emanation of energy, whereas passive information transfer entails a receiveonly capability. Currently wireless technologies use IR, acoustic, RF, and optical but, as technology evolves, wireless could include other methods of transmission.
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In the context of object-oriented programming, the forwarding of a request by an object to another object or delegate. An object delegates if it does not have a method to handle the message. The notation that an object can issue a request to another object in response to a request. The first object therefore delegates the responsibility to the second object. Delegation can be used as an alternative to inheritance.
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An active entity that seeks information about or data from passive objects through the exercise of access. A subject can be a user, a program, a process, a file, a computer, a database, and so on. An active entity, generally in the form of a person, process, or device that causes information to flow among objects or changes the system state. Generally an individual, process, or device causing information to flow among objects or change to the system state.
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A requesthandling mechanism that selects a method based on the type of target object. This allows the specification of one request that can result in invocation of different methods depending on the type of the target object. Most objectoriented languages support the selection of the appropriate method based on the class of the object (classical polymorphism). A few languages or systems support characteristics of the object, including values and userdefined defaults (generalized polymorphism). Having many forms. In the context of object-oriented programming terminology and concepts, the characteristic of an object to provide different behaviors based on the same message and methods owing to variances in external conditions.
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