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A sequence diagram is a model describing how groups interact over time. It is an interaction diagram that details how operations are carried out: what messages are sent and when.

You use the sequence diagram model to describe the aspects of your system that change over time. These are events that mark changes, sequences of events and so forth. The time sequence interaction is shown in the sequence diagram and consists of two dimensions. The vertical dimension (time) and the horizontal dimension (different objects).
UML sequence diagrams can be used to:

The elements of the sequence diagrams are available in the tool bar: