This Sequence Diagram Model, also known as an event diagram, represents the flow of messages in the system. It aids in visualizing a variety of dynamic scenarios. It depicts communication between any two lifelines as a time-ordered sequence of events in which these lifelines participated during the run time. The lifeline is shown by a vertical bar in UML, while the message flow is represented by a vertical dotted line that spans the bottom of the page. It incorporates both iterations and branching. A lifeline shows an individual participant in the sequence diagram.
