Sequence Diagram |
Sequence diagrams belong to a group of UML diagrams called Interaction Diagrams. Sequence diagrams describe how objects interact over the course of time through an exchange of messages. A single sequence diagram often represents the flow of events for a single use case.
An instance of a class shows a sample configuration of an object. On the sequence diagram, each instance has a lifeline box underneath it showing it's existence over a period of time.
An actor is anything outside the system that interacts with the system. It could be a user or another system.
The message indicates communication between objects. The order of messages from top to bottom on your diagram should be the order in which the messages occur.
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