Behavior The set of services that an entity provides.
Class A template that specifies the structure and behavior of a set of objects.
Instance A particular object having the structure and behavior specified by its class.
Instance variable A data resource of a particular object.
Object Synonym for instance.
Message The means by which an object requests a service from another object.
Method The operation performed by an object when it receives a message.
Receiver An object that detects a request for a service.
Sender An object that requests a service.