UML CommunicationUML Communication (called Collaboration prior to UML 2.0) is a type of object interaction diagram that emphasizes the data links between participants.
Association lines are drawn between objects. Couples are attached to the lines showing the name, direction and parameters of object operation calls.
UML SequenceThe UML Sequence diagram shows the same type of information. The diagram shows how one part of the design works with each object represented by a named box with a vertical lifeline below it.
This diagram highlights the time sequence of object operations and events. Timing Diagrams and other UML Notation show interactions between objects.